All modules follow the moog format ( 5U industry standard) and come with the standard „.com“ connector for easy integration in existing systems.
Each module has its own power regulation to +12/-6 Volt, except for the SW901AB oscillator bank.
The power regulation for SW901AB is done on the 901A which supplies the 901B`s.
The same is for SW921AB.
The SW901 Voltage-Controlled Oscillator is a widerange generator of repetitive waveforms, the frequency of which is controlled by the sum of applied control voltages. The total frequency span of the oscillator is 0,1 to 15.000 Hz in six overlapping ranges. Four waveform outputs are available: sawtooth, triangular, sine and pulse. The width of the pulse waveform is continuously variable, by means of a front panel potentiometer, from complete symmetry to 8.1 asymmetry. One fixed and one variable output are available for each waveform.
This Module is based on the original design from 1964
Characteristic: | 1V/Octave |
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Impedance: | 100k ohm |
Number of control inputs: | 3 |
Waveforms: | Sinewave / Sawtooth / Pulse / Triangular available simultaneously |
Impedance of fixed outputs: | 600 ohm |
Level of outputs: | 0,5 V RMS |
Impedance of vari. outputs: | 1500 ohm |
Level of vari. outputs: | 0 - 0,5 V RMS |
Power requirements: | +/-15 Volt at + 65 mA / - 55 mA |
Depth: | 180 mm (incl. connector board) |
The SW901A Oscillator Controller and the SW901B Oscillator are, respectively, the controlling and the oscillating / wave-shaping sections of the SW901 Voltage Controlled Oscillator. The separation of the functions of the SW901 into two modular instruments allow the assembly of a bank of oscillators, all of which are controllable from one controller. The SW901A panel contains the control voltage input jacks and potentiometer which vary the frequencies of all the controlled oscillators simultaneously. The SW901B panel contains frequency range controls and fixed level output jacks for each waveform. One controller may control up to 7 Oscillators. A bank of oscillators in which the intervals between the frequencies remain constant as the frequencies themselves are varied obviously has great musical value.
This Module is based on the original design from 1964
SW901A | |
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Number of control inputs: | 3 |
Impedance: | 100k ohm |
Characteristic: | 1V/Octave |
SW901B | |
Number of outputs: | 4 Sinewave / Sawtooth / Pulse / Triangular |
Impedance of outputs: | 600 ohm |
Level of outputs: | 0,5 V RMS |
Power Requirements | “.com” connector on SW 901A +/-15 Volt at + 120 mA /- 90 mA. All connected SW 901B ́s are supplied from SW 901A |
Depth: | 180 mm (incl. connector board) |
The SW921 Voltage Controlled Oscillator is a variable waveform generator which produces frequencies ranging from 0,01 to 40.000 Hz. Four waveforms are available: sine, triangular, sawtooth and rectangular with variable duty cycle. Both fixed and variable levels can be obtained from front panel output jacks.Voltage controlled
rectangular width is set by a knob and with accompanying voltage input jacks. Clamping point (waveform reset control) may be set by a knob and accompanying trigger inputs. Multiple frequency control inputs can be plugged into this module in parallel. This module functions as both an audio or control voltage generator.
Besides the basic musical applications of a Voltage Controlled Oscillator the SW921 offers voltage controlled rectangular width which will vary the harmonic structure of the rectangular waveform and provide constant timbre changes within the oscillator, when controlled with a low frequency control voltage from another oscillator. An interesting phase cancellation effect is created when a voltage controlled rectangular waveform is added to the sawtooth waveform from the same oscillator.
This Module is based on the original design from 1974.
Characteristic: | 1V/Octave |
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Impedance: | 100k ohm |
Number of control inputs: | 3 |
Waveforms: | sinewave / sawtooth / rectangular / triangular available simultaneously |
Impedance of fixed level outputs: | 800 ohm, except rectangular 50 ohm |
Level of outputs: | approx. 0,6 V RMS |
Level of auxiliary outputs: | approx. 2,5V RMS |
Power requirements: | +/-15 Volt at at +/- 50 mA |
The SW921A Oscillator Driver is a control voltage processor which runs associated SW921B oscillators through internally wired connections. The SW921B generates frequencies from 1Hz to 40kHz minimum. This oscillator generates both sub-audio and audio frequencies for control and audio signal use. Fixed level outputs for sine, triangle, sawtooth and rectangular waveforms are available. DC Modulate is a linear frequency control input, AC Modulate input is a capacitor coupled circuit. SW921B Oscillators may be phase locked together via the Synch Input Jack and the associated three position Synch Switch. A sawtooth waveform is recommended for best synchronization results. This Module is based on the original design from 1974.
SW921A | |
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Impedance: | 100k ohm |
Characteristic: | 1V/Octave |
Impedance: | 100k ohm |
SW921B | |
Number of outputs: | 4 Sinewave/ Sawtooth/ Rectangular/ Triangular |
Impedance of outputs: | 1k ohm |
Level of outputs: | 0,6 V RMS |
DC/AC Modulate: | Linear FM / AC Modulate input signal is rolled off below 5 Hz |
Synchronisation: | Nominal input level -4 dBm |
Mode Switch: | Center position defeats synchronization. Strong position causes oscillator to lock onto harmonic or sub-harmonic signal. Weak position reduces locking strength by a factor of 4. |
Power Requirements: | +/-15V at +120mA/- 120mA. |
All connected SW921B´s are supplied from SW921A. |
The SWCP3 module is a 4 x 1 mixer with positive and negative outputs and a maximum gain of 2. This mixer can combine both AC and/or DC voltages.
This Module is based on the original design from 1968
The SWCP3H half size module has has the same function like the SWCP3 plus a multiple in addition.
The SWCP3H-Switch has the same functionality like SW CP3 but in addition it containes routing switches for 4 external CV´s to the above Oscillator Bank like on the SW 3P-2020.
The four channel mixer is useful for combining several signals to form a single output. Audio signals from up to four different sources can be varied in relative volume before processing the mix through filters or amplifiers for a final result. Control voltages can be mixed, attenuated and phase inverted before being introduced into a voltage controlled module. In addition, the CP3 mixer can be used for phase cancellation of complex sounds, e.g. if two or more signals with similar frequency content are combined at opposite phase relationships and for feedback where the output of the mixer is sent directly back to an input of the CP3 mixer.
Input Impedance: | 25k ohm |
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Output Impedance: | 600 ohm |
Gain: | x2 maximum |
S/N Ratios: | > 60 dB |
Outputs: | positive and negative outputs |
Power Requirements: | +/-15 Volt at +/- 30 mA |
Depth-SWCP3-MIXER: | Approx. 80 mm |
Depth-SWCP3H MIXER: | Approx. 58 mm |
The SW984 Four Channel Matrix Mixer is an AC coupled 4-input, 4-output matrix with bass and treble tone controls for each output channel. Each input has a separate attenuator for each of the four output channels. Thus, a matrix of 16 input attenuators provides maximum channel separation, or variable combinations of volume balance. Tone controls for each of the output channels can attenuate or emphasize bass or treble signals. Flat signal response is achieved with the control settings kept at “5” on the potentiometers. These are 2-pole active tone controls.
The SW984 Mixer serves as a final audio summing device for up to four different inputs. Outputs can feed any line level monitor or recording system. Optimum impedance match is 10k ohm or less. The multiple inputs and outputs of this module serve as good mixing point for external sound processors which will modify or add echo to the synthesizer signal before entering the recording or monitoring system.
Input Impedance: | 25k ohm |
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Output Impedance: | 5k ohm |
Gain: | approx. x 1,25 |
S/N Ratios: | > 65 dB |
Inputs: | Four input potentiometer per channel, AC coupled |
Outputs: | 4, AC coupled |
Power Requirements: | “.com” connector +/-15 Volt at +/- 75 mA |
Depth: | 160 mm |
SW904A Voltage-Controlled Low Pass Filter attenuates frequencies above the fixed control voltage cutoff point at a rate of 24 dB per octave. The cutoff frequency is voltage controlled through the control input jacks. The sum of the applied control voltages doubles the frequency of the cutoff point for each one Volt increase. The regeneration potentiometer varies the amount of internal feedback, creating a resonant peak at the cutoff frequency. This resonant peak will break into oscillation at clockwise settings of the regeneration potentiometer, creating a voltage controlled sine wave generator. The fixed control voltage potentiometer covers a 12 Volt (octave) range. The overall range of the FCV potentiometer is determined by the Frequency Range switch, which moves the frequency cutoff range in twooctave steps.
This Module is based on the original design from 1970
The Voltage Controlled Low Pass Filter is one of the building blocks of analog synthesis. The characteristic upper spectral sweep found in wind instruments articulation is simulated utilizing this filter and the DC voltage supplied by an Envelope Generator with each trigger from a controller. Virtually, every instrumental simulation can use this filter arrangement as part of its overall patch. The lowpass filter is a key module in creating widely varying timbres via subtractive synthesis.
Cutoff Frequency fc range: | <= 1Hz to <= 80 kHz |
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Signal Input Impedance: | 9.2 k ohm |
Signal Input Level: | 0 dBm nominal, +10dBm max without clipping |
Attenuation slope above Fc: | 24 dB per octave |
Control Input Frequency Response: | DC to 50 kHz |
Control Input Impedance: | 100k ohm |
Number of control inputs: | 3 |
Output Impedance: | 680 ohms (AC coupled) |
Power Requirements: | +/-15 Volt at + 75 mA / - 40 mA |
Depth: | 160 mm |
The SW904B Voltage Controlled High Pass Filter attenuates input signal frequencies below its nominal cutoff setting. The attenuation below FCV cutoff setting is 24 db/oct. As the fundament is generally the loudest frequency component of a complex tone, deletion of the lowest frequency range can radically alter the timbre. The FCV cutoff point is raised or lowered in octave per volt control inputs. The Frequency Range switch sets the overall range of frequencies covered by the Fixed Control Voltage potentiometer. The Low range encompasses 4 Hz to 20 kHz, while the High range shifts 1,5 octaves up to 10 Hz through 50 kHz.
This Module is based on the original design from 1966
The Voltage Controlled High Pass Filter is most useful for altering the timbre of input signals by deleting the predominance of the fundament partial in a complex tone. Voltage control of this module often creates a spectral sweep radically different from those associated with acoustic instruments. A thin or “tinny” sound often results when using this filter. Low frequency control voltages (10 – 20 Hz) can, if their gain is boosted from the nominal fixed level output of the 901 Oscillator, effect in a rattling or “scraping” sound (almost regardless of input signal). Connected to the Low Pass Filter in parallel, series, the High Pass Filter helps form band pass and band reject filters.
Cutoff Frequency fc range: | 1Hz to 50 kHz |
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Signal Input Impedance: | 33k ohm |
Signal Input Level: | 0 dBm nominal, +10dBm max without clipping |
Signal gain: | 0 dB nominal |
Cutoff slope: | 24 dB per octave |
Control Input Frequency Response: | DC to 16 kHz |
Control Input Impedance: | 100k ohm |
Number of control inputs: | 3 |
Output Impedance: | 680 ohm (AC coupled) |
Power Requirements: | +/-15 Volt at + 75 mA / - 50 mA |
Depth: | 160 mm |
SW904C Filter Couples is a connecting module which combines the functions of the 904A Lowpass and 904B Highpass Filters together. In the “off” position, the Highpass and Lowpass Filters are disconnected from the 904C and may be used independently. When switched to the “Brandpass” mode, Highpass and Lowpass Filters are coupled in parallel to process a central band of frequencies – deleting both bottom and top. The bandreject mode presents the inverse relationship, rejecting a central frequency band, and passing only the lowest and highest frequency components. Voltage controlled bandwidth and center frequency controls are included on the coupler. Bandwidth can be etended to three octaves with manual settings or control voltage. Center Frequency ranges from 5Hz to 20kHz, via manual or voltage controlled settings.
When using the 904C for Bandpass or Bandreject filtering, the following standard settings should be obeserved:
| 904A Fixed Control Voltage | = | +6 | ||
| 904A Frequency range | = | 2 | ||
| 904B Fixed Control Voltage | = | -1 | ||
| 904B Frequency Range | = | low |
Note:
Passband settings = Bandwidth knob plus control voltage.
Notchwidth = Minus bandwidth knob minus control voltage.
The SW907 and SW907A Fixed Filter Bank are non-voltage controlled modifers, who emphasize or reduce the gain of the center frequency bands indicated on each of the eight center potentiometers, in addition to the cutoff points set by low pass and high pass lters at either frequency extreme. A total of 10 overlapping LC networks are included.
Signal Input impedance: | 10k ohm |
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Signal Output impedance: | 680 ohm |
Signal Gain: | unity |
Output Noise: | < 65 dB |
Power Requirements: | +/-15 Volt at + 20 mA / - 10 mA |
The SW907A Fixed Filter Bank is a non-voltage controlled modifier, which emphasizes or reduces the gain of the center frequency bands indicated on each of the eight center potentiometers, in addition to the cutoff points set by low pass and high pass filters at either frequency extreme. A total of 10 overlapping LC networks are included.
This Module is based on the original design from 1968
The Fixed Filter Bank is often referred to as formant filter because it can be set to emphasize or attenuate midrange frequencies, which fall within a particular band, no matter how the frequencies of the signal are moved. Like many acoustic instruments, a characteristic set of formants, are always a part of the resultant output (given a particular complex waveform). Emphasized bands of this sort are particularly evident with double reed instruments. Thus, this filter is part of the patch for these simulations.
In addition, completely different timbres can be set up for different ranges of the same tone, if the output of the filter is recombined with unfiltered frequencies at different levels.
Signal Input impedance: | 10k ohm |
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Signal Output impedance: | 680 ohm |
Signal Gain: | unity |
Output Noise: | < 65 dB |
Power Requirements: | +/-15 Volt at + 20 mA / - 10 mA |
Depth: | 160 mm |
Similar in function to the Moog 907 Fixed Filter Bank, the SW914 Extended Range Fixed Filter Bank is a non-voltage controlled modifier with 14 separate passband controls: high-pass, low-pass, and 12 center frequency knobs. Each passband range has an attenuation slope of 12 dB per octave above or below the center frequency indicated.
This Extended Range Filter Bank is highly useful for emphasizing or attenuating frequency bands in the mid-range of hearing. Instrument simulation, especially double reeds, is a major application for this module due to their varied resonances in mid-range frequency bands. Varying frequency response in each of the half/ octave ranges, even slightly, will change the timbre of a tone as it is moved from one region to the next. Radically different timbres can be overlapped from one frequency range to another, by utilizing the 914 as a fixed cut-off filter. In one range, a particular timbre may predominate when mixed with another. When the signal is moved into a cut-off range, the non-filtered frequencies of the mix will assume maximum importance.
The SW902 Voltage-Controlled Amplifier is a differential input and output circuit which gives an overall voltage gain of 2 (6 dB) when manual control potentiometer is at maximum, or when a control voltage of 6 Volts is applied to the control input. Two modes of gain are available: Linear and exponential.
This Module is based on the original design from 1969
The SW902 Voltage-Controlled Amplifier is used in any circumstances where variable gain is desired for gating or modulating AC or DC voltage sources. Articulation of a tone or sound, utilizing oscillators, controllers, envelope generators and the VCA is the basic traditional patch around which most performance oriented synthesizers are based. In addition to DC control voltage, the VCA can be controlled by varying voltages (AC) from sources like the SW 901 Oscillator. Slowly varying control voltages (2-9 Hz) can create tremolo or echo like effects upon an audio signal. Audio control frequencies create sidebands with often clangorous effects, usefull for a variety of audio timbres and percussive sounds. The inverting outputs of the VCA can be useful for spatial modulation, signal inverting of control voltages, controlling two oscillators in contrary motion with a single control signal and various amplitude sampling arrangements.
Signal Input Frequency Response: | DC to 50 kHz |
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Signal Input Impedance: | 10k ohm nominal |
Control Input Frequency Response: | DC to 50 kHz |
Control Input Impedance: | 100k ohm nominal |
Number of control inputs: | 3 |
Output Impedance: | 680 ohm |
Power Requirements: | +/-15 Volt at + 75 mA / - 40 mA |
Depth: | 160 mm |
At the introduction of a V-trigger signal from an external source, the SW911 Envelope Generator produces a single voltage contour whose time/voltage variation is determined by potentiometers T1, T2, T3, and a time constant sustaining level potentiometer (Esus). The release of the V-Trigger signal will direct the voltage contour to T3 (final decay) regardless of what stage (T1, T2 or E) was in current operation.
This Module is based on the original design from 1968
The SW911 Envelope Generator completes one of the most important musical functions: That of producing a variable one-shot control voltage contour in time. This output is thus capable of controlling any voltage controlled module – most notably a Voltage Controlled Amplifier – resulting in the articulation of a single sound. Keyboard controllers initiate a trigger on every key, which is depressed in sequence specifically to fire the envelope generator. Ribbon Controllers, Sequencial Controller Complements and Envelope Followers, all output V-trigger which initiate the action of this module as well. Characteristic spectral sweeps associated with the articulation of a note by an acoustic instrument are simulated by utilizing the Envelope Generator to control the frequency cutoff of the SW 904A Low Pass Filter, SW 904B High Pass Filter or other associated modules. With considerable attenuation, the Envelope Generator can create tunable glissandi when controlling a single oscillator. Envelope Generators are used in association with the SW 911A Dual Trigger Delay to create multiple or combined DC voltage contour outputs.
Trigger Input: | V-Trigger (internally converted to S-Trigger) |
|---|---|
Time Range on T1, T2, T3: | 2 msec to 10 sec |
Peak DC output on Esus: | 5,5 Volt |
Power Requirements: | +/-15 Volt at + 25 mA / - 20 mA |
Depth: | 160 mm |
The SW911A Dual Trigger Delay is designed to be used with 2 or more SW911 Envelope Generators. It provides one or two time delays on an input trigger voltage – bound for the activation of an envelope V-trigger. Delay stops immediately upon termination of input trigger.
Three different modes of operation are available via coupling mode switch:
OFF: Delays are activated independently through individual trigger inputs
PARALLEL: Trigger input on top SW 911A activates timing circuit on both simultaneously.
SERIES: Trigger input on top 911A activates top timing circuit, then triggers second timing circuit upon delay time of first.
This Module is based on the original design from 1968
Standard synthesizer envelopes provide anywhere from two to four DC voltage settings over a triggering period. In practice, acoustically generated sounds have many variations of amplitude or filtration within a given articulation or generation. The use of a SW911A to couple envelopes together creates a much more complex series of voltage variations for the synthesist to use for the articulation of each sound.
Trigger Input: | V-trigger (internally converted to S-trigger) |
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Trigger Output: | V-trigger (internally converted from S-trigger) |
Delay periodes: | 2 msec to 10 sec |
Power Requirements: | +/-15 Volt at + 25 mA / - 20 mA |
Depth: | 160 mm |
The SW912 Envelope Follower produces two functions, which can be used separately or in conjunction. The follower circuit signal input presents a control voltage output (DC) proportional to the average amplitude of the AC input signal. The second function, a Schmitt trigger, generates a V-trigger above a threshold voltage (comparator), when a slowly varying or DC voltage is introduced at the control input jack. The normalling of the control output of the follower circuit to the control input of the Schmitt trigger circuit allows both control voltage and trigger to be generated from a single variable source.
THe SW912 Envelope Follower is an extremely useful module for interfacing external sources with the many functions of the synthesizer, which require both control voltages and triggers to function. Filter or amplitude variations can be achieved by routing the audio signal to both the processing modules and the Envelope Follower. The control voltage of the follower circuit can raise or lower the cutoff frequency of a voltage controlled filter. At the same time, the Envelope Generator can be triggered by the V-trigger output of the follower, causing a VCA to gate the original signal above a certain amplitude. This latter operation can be very useful as a noise gate, closing down an audio signal when the level drops below a nominal setting. One further use involves generating random triggers from the Envelope Follower by utilizing white noise or pink noise as a signal input and carefully setting the threshold level to achieve a speed of trigger selection.
Nominal Input impedance: | 100k ohm |
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Nominal Output impedance: | 69k ohm |
Control Input impedance: | 61k ohm |
Control Output: | Connected to control input internally |
Power Requirements: | +/-15 Volt at + 40 mA / - 35 mA |
Depth: | 160 mm |
A ringmodulator is an analog sound modification system that takes two inputs, one a program-signal and the other a carrier frequency, being and produces a single output. The program signal is normally a waveform produced by the output from a microphone (voice) or any other source of signal, while the carrier signal is normally a sine wave. The function of the ring modulator is to produce the sum and difference frequencies of the program signal and carrier signal.
It was probably electronic music pioneer Karlheinz Stockhausen’s use of the ringmodulator that inspired an entire generation of rock musicians. Stockhausen’s Mixture (1964), for example, was written for a ring modulated symphony orchestra. Ringmodulation is often used to simulate the sounds of tuned percussion instruments that produce inharmonic frequency spectra, such as bells and chimes. It can also produce timbres that are difficult to achieve by any other method of synthesis. Among all signal processors, the multipliertype ring modulator takes a unique position since it is capable of converting existing sounds into new sounds with entirely different overtone spectra that do not resemble the original acoustical phenomena.
Input Impedance program input: | 47k ohm |
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Input Impedance carrier input: | 47k ohm |
Output Impedance: | 680 ohm |
Nominal Input Voltage: | 1V RMS (higher levels will lead to distortion which can be an additional interesting effect) |
Gain: | approx. 0 |
Frequency range: | 0,15 kHz to 20 kHz |
Power Requirements: | +15 Volt at + 90 mA |
Depth: | 160 mm |
A frequency shifter is an audio signal modifier which shifts the entire frequency spectrum of the applied signal by a given amount. The Model SW 1630 Bode Frequency Shifter allows the amount of shift to be accurately and continuously controlled over a span of -5000 Hz to +5000 Hz, utilizing voltage and/or manual control. The relationship between the control voltage sum and the amount of shift may be either linear or exponential. Up-shifted and down-shifted outputs, as well as a continuously variable mixture of the two, are available simultaneously and independently. Variable threshold squelch and zeroadjust fine tuning controls are provided.
The Model SW 1630 Bode Frequency Shifter changes the ratios between the frequency components of an audio spectrum, thus producing a variety of novel sound quality transformations. Applications include a wide variety of tone color modification, P.A. feedback suppression, linear frequency modulation, novel tape feedback effects, and the generation of dynamically varying clangorous tones.
In shifting the components of the input audio spectrum by a given amount, the SW 1630 Bode Frequency Shifter changes the original ratios between the overtones and other frequency components of the input signal. Rather than being a transposing device, this instrument is a means for achieving an extremely wide variety of tone color modification. Whether the amount of frequency shift is large or small, static or time varying, or whether the input signal is simple or complex, the processed outputs will generally be musically interesting.
Nominal Input Impedance: | 50k ohm |
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Nominal Input Level: | +2dBm |
Frequency Range: | 30Hz to 16kHz |
Nominal Output/Input gain: | Unity |
Less than 0.1% total hum and noise | |
Variable threshold squelch minimizes apparent carrier bleedthrough due to input signal background noise | |
Accurately shifts input signals over the audio frequency range of: | 30 Hz – 16 kHz |
Amount of shift is continuously variable from | -5 kHz, through zero to +5 kHz |
Amount of shift is accurately voltage variable – either linear or exponential control mode is available | |
Less than 1% total unwanted modulation and distortion products | |
Power requirements: | +/-15 Volt at + 100 mA / -100 mA |
The Model SW 735 is the rack version of the Bode Frequency Shifter including a power supply.
From an electrical point of view it is identical to the Model SW 1630.
This Module is based on the original design from 1974
The Model SW 735 is the rack version of the Bode Frequency Shifter including a power supply.
From an electrical point of view it is identical to the Model SW 1630.
This Module is based on the original design from 1974
Nominal Input Impedance: | 50k ohm |
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Nominal Input Level: | +2dBm |
Frequency Range: | 30Hz to 16kHz |
Nominal Output/Input gain: | Unity |
Less than 0.1% total hum and noise | |
Variable threshold squelch minimizes apparent carrier bleedthrough due to input signal background noise | |
Accurately shifts input signals over the audio frequency range of: | 30 Hz – 16 kHz |
Amount of shift is continuously variable from | -5 kHz, through zero to +5 kHz |
Amount of shift is accurately voltage variable – either linear or exponential control mode is available | |
Less than 1% total unwanted modulation and distortion products | |
Power requirements: | +/-15 Volt at + 100 mA / -100 mA |
The BODE BARBERPOLE PHASER offers 9 phase stages and various sound manipulation features. The option to insert an additional effect into the feedback loop or one of the two audio pathes is one of them.
The main feature of the BPP/product is infinity phasing. Infinity phasing is a psychoacoustic effect based on the Shepard scale, which was introduced in 1964 by the psychologist Roger N. Shepard. It creates the illusion of an infinitely ascending or descending scale that never exceeds the limit of one‘s hearing.
The combination of the various features like left-right panning or the transfer of a monofonic input signal into a stereo output signal and modulation of the phaser creates a sonic soundstage in the tradition of Harald Bodes ”Klangumformer” principal. If you think you know the sound of a Phaser, you need to listen to the Barberpole Phaser to understand the possibilities of a ”Klangumformer”
Nominal Input Impedance: | 50k ohm |
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Nominal Input Impedance: 50k ohm Nominal Input Level: | +2dBm |
Frequency Range: | 30Hz to 16kHz |
Nominal Output/Input gain. | Unity |
S/N Ratio >60dB | |
Input level control and overload indication | LED responds to a level of 8dB below overload |
V Trigger IN/OUT on the back | |
SEND&RETURN for Feedback and OUT A |
The Random Signal Generator produces continuous bursts of random frequencies and waveshape from approximately 25 Hz to 20 kHz. Two types of energy distribution are provided: White noise and pink noise. The former distributes amplitude evenly throughout the indicated audio spectrum. The latter reduces the amplitude of each frequency increment proportionally to produce equal energy per octave. Pink noise, thus, sounds “lower” in pitch to the ear.
This Module is based on the original design from 1969
Almost all acoustically generated sounds one hears, at all times, contain some amount of random noise. Most obvious are wind, surf and thunder. Some amount of unpitched sound is evident in just about every environment. Acoustic instruments produce varying amount of unpitched sound along with specific notes. Drums, Tam-Tam, blocks, gongs and various other percussion instruments are all unpitched instruments. White and pink noise provides the synthesist with a basic source for simulating these instruments, as well as a source for recreating “environments”.
As an audio source, the Random Signal Generator is most often used in connection with filters to create a desired frequency band or correct spectral sweeps. The Random Signal Generator also provides a source of control voltage for filters, oscillators, amplifiers and other voltage controlled modules, producing interesting random modifications.
As a source for the Envelope Follower, random triggers can be produced as well as slowly varying DC voltage contours (with slow response time). Noise is also useful as a control source for sample and hold circuits and random sequencer triggers.
Average level white noise: | -10 dBm (30 Hz – 20 kHz) |
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Average level pink noise: | -4 dBm (30 Hz – 20 kHz) |
Power Requirements: | +/-15 Volt at + 35 mA / - 30 mA |
Depth: | 80 mm |
The Reversible Attenuator processes a control voltage destined for the CV input of a speci c module. As the knob rotates counter-clockwise from 10 to 0, the proportion of the control voltage applied to the input jack that appears at the output jack decreases from 100% to 0%. As the knob rotates past 0 toward -10, the output voltage will rise to 100% of the input voltage but the polarity will be reversed.
The SW995 Attenuators panel consists of three „passive circuits“, each made of a 25k potentiometer between input and output. The signal input to the top attenuator is chained to the bottom two in series. Introduction of a patch cord into middle or bottom input breaks the normalling system. Attenuators reduce the gain or amplitude of any applied input signal, con- trol or audio.
The dual multiple panel consists of two sets of four jacks. Each set of jacks has been wired together. The multiple is a “device” which permits multiple distribution of one signal to several different places. This process is often called signal splitting. Multiples are used for many purposes; from linking two patch cords together, sending a single signal to several differ- ent modules at the same time.
The multiple part consists of three sets of four jacks. Each set of jacks has been wired together. The multiple is a “device” which permits multiple distribution of one signal to several different places. This process is often called signal splitting. Multiples are used for many purposes; from linking two patch cords together, sending a single signal to several different modules at the same time.
The Attenuator part consists of three „passive circuits“, each made of a 25k potentiometer between input and output. The signal input to the left hand attenuator is chained to the right hand two in series. Introduction of a patch cord into middle or right hand input breaks the normalling system.
Attenuators reduce the gain or amplitude of any applied input signal, control or audio. Moving clockwise from zero gain to unity gain with input, these attenuators can be used for reducing the effect of a control upon a voltage controlled module, providing up to three variable outputs from a single source input or reducing the gain of an entire signal complex.
Depth: | Approx. 58 mm |
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The SW905 Reverberation Unit utilizes a dual springtype acoustic delay line to produce a succession of decaying echoes of an audio signal. A single panel control determines the ratio between the amounts of reverberated and non-reverberated signals that appear at the output jack. In addition the SW905 offers two modes of operation:
Regular mode
the relative amount of the echo signal and direct signal can be continuously changed from 100% direct signal to 100% echo signal.
„Emerson“ modification
the output signal is continuously mixed with the direct signal and the knob on the faceplate controls the level of the mix. The direct signal is passed through unaffected.
Both modes of operation can be selected on the board of the module.
When a dynamically varying signal is applied to the input of the SW905, the output will consist of a series of closely spaced echoes, the subjective effect of which is similar to that of reverberation of sound. When a static signal is applied to the input of the SW905, the output will also be static. The SW905 will perform in this application like a formant filter, strongly coloring the timbre of any signal with appreciable harmonic content.
This Module is based on the original design from 1967
Power Requirements: | +/-15 Volt at + 20 mA / - 20 mA |
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Depth: | 160 mm |
The White and Pink noise outputs of the 923 Random Noise/Filter module produces continuous bursts of random frequencies and wave shape throughout the audio spectrum. The two manual sweep filters, Lowpass and Highpass, are single pole circuits with a frequency cutoff slope of 6dB/octave.
Like the 903A Random Signal Generator, white and pink noise are a fundamental sound source for non-pitched sounds, and virtually all environmental/acoustic ambiences.
Average output level White: | -10dBm (30Hz - 20 kHz) |
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Pink | -4dBm |
Lowpass Filter Attenuation slope above fc: | 6db/octave |
Frequency Range: | 10Hz -10kHz |
Highpass Filter Attenuation slope below fc: | 6dB/octave |
Frequency Range: | 10Hz -10kHz |
Power Requirements: | +/-15V at +/- 35 mA |
The SW 960 Sequential Controller has a wide variation of functions, both as an independent module and in combination with the SW 961 Interface and SW 962 Sequential Switch. The sequence module consists of a voltage controlled clock oscillator which drives three rows of eight steps each. Voltage range switches for each row determine the DC voltage range of each pot. Jacks for trigger inputs and outputs appear below each column. Timing control for the eight steps is accomplished via the Third Row Control of Timing switch.
In addition to the regular functions of the sequencer the SW 960 sequencer can be driven at audio speeds to form a “graphic waveform generator“ great variations of timbre can be obtained by varying the voltage of each step in the sequence. Separate triggers for each stage can trigger the alteration of totally different sounds. In combination with the SW 961 Interface, highly flexible rhythm tracks can be created with different instrumental sounds alternating on different beats.
Clock Oscillator | |
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Frequency Range: | 0,1Hz to 500Hz, VC 1V/Oct |
Waveform Out: | Rectangular |
Output Impedance: | 4,7 k nominal |
Input Impedance: | 100 k nominal (control input) |
Oscillator on/off trig: | > 3 Volt trigger |
Ext.Shift input: | > 3 Volt trigger |
V-triggers: | > 3 Volt trigger |
Control Voltage Outputs: | |
X1: 2 Volts | |
X2: 4 Volts | |
X3: 8 Volts | |
Power Requirements: +/-15 Volt at 300 mA / 40 mA |
Four independent circuits are found on the SW 961 Interface: One Audio-In to V-trigger Out circuit, one S-trigger In to V-trigger Out circuit and two V-trigger In to S-Trigger/V-trigger Out circuits. All interface circuits may be used simultaneously, in combination or separately.
The SW 961 Interface module serves as an „intermediate“ operations module, useful for converting one type of signal to another – for purposes of switching or controlling a particular function. The Audio-to V-trigger section of the 961 Interface is useful as a trigger source.
SW 961/961CP | |
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All V-triggers for entire module require (input) or generate (output) a 3 Volt pulse. | |
Power Requirements: | +15 Volt at 100 mA |
The SW 962 Sequential Switch selects between two or three signal inputs, coupling one signal to the output at a time. A V-trigger pulse introduced to the Shift Input initiates the sequence.The sequential switch will alternate between stages one and two until a standard phone plug is patched into Signal Input Three.
SW 962/962CP | |
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Functional Requirements: | V-Triggers: 3 Volt Pulse |
Power Requirements: | +/-15 Volt at 120 mA / 10 mA |
