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GS1-M
The GS1-M is a switchable averaging or summing mixer. Typically, with audio signals, you want to provide a unity gain style mixer, i.e. the signals are mixed, or as we call it here, averaged, while maintaining a common gain across all signals. So you keep the same volume essentially. Sometimes you may want to boost…
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GS1-O
The GS1-O is based on the classic Curtis CEM3340 VCO IC. The circuit can use either a CEM3340 (the Rev G re-release is readily available, and of course if you have some older NOS you can use those also) or the Alfapar AS3340 clone IC. The IC provides Triangle, Square and Sawtooth right from the…
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GS1-NR
The GS1-NR is a simple utility module that provides two functions. The first is a ring/cross modulator function using the same LM1496 balanced modulator/demodulator IC as found in the Roland System 100M circuits. The second provides a transistor noise generator which can output both white and pink noise. The module ring modulation circuit allows for…
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GS1-E
4hp ADSR pot controls Manual gate momentary switch CV Inputs: Gate CV Outputs: 2x envelope out, 1x inverted envelope out The GS1-E is a simple CV envelope generator. Based on the design used in the Roland System 100M, this envelope would be classed as “fast” or fairly “snappy”. The module provides pots for the usual…
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GS1-L
8hp Waveform selection and Frequency controls Toggle switch between L,M,H freq ranges Toggle switch between L,H output levels CV Inputs: Frequency CV Output: LFO Out The GS1-L is a simple utility LFO module, using the design of the LFO provided by Roland within the System 100M. The generation of the waveforms and output stage make…
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GS1-F
8hp Audio Inputs: 3x each with gain pot CV Inputs: 3x each with attenuation pot Audio Outputs: 1x filter out Pot controls for Frequency and Resonance LPF on/off toggle switch (fixed) The GS1-F low pass/high pass filter module is based on Roland’s 4 pole filter design using the BA662 differential op-amp circuit. The classic buttery,…
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GS1-A
8hp Audio Inputs: 3x each with gain pot CV Inputs: 3x each with attenuation pot Initial GAIN pot for CV inputs Linear / Exponential toggle switch Audio Outputs: 3x (line, medium, euro) 6hp Audio Inputs: 2x each with gain pot CV Inputs: 2x each with attenuation pot Initial GAIN pot for CV inputs Linear /…
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TB-EFA
The TB-EFA shares the same ‘3 and a bit’ pole filter circuit as the Roland TB-303. It also provides a complete version of the envelope used by the 303 with decay control. Rounding off the module is the BA662 based VCA circuit which is also controlled by the same envelope as the filter. Like the…
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TB-EF
10hp Manual Cutoff, Drive, Resonance, Chirp, Envelope Mod & Accent Controls CV Inputs: Gate, Accent and Cutoff Audio Inputs: Signal In Audio Outputs: Filter Out The TB Filter Envelope module is inspired by the filter, envelope and accent circuits of the Roland TB 303. It copies the same 3 and a bit pole low pass…
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TB-O
8hp Tune & Manual Pulse Width Control FM & PWM Attenutation Control Switch between Manual PW & PWM CV Inputs : V/Oct, PWM, FM Audio Outputs : Saw, Sqr, Tri, STS The TB-O shares the same saw-core oscillator circuit as the Roland TB-303. It also generates the distinctive, not quite square using the same technique…
Ge0sync Synth 