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TB-EFA Rev2
The TB-EFA Rev2 is the second version of our best selling TB-EFA module. It 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…
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GS1-U
The GS1-U builds on the GS1-NR utility module and provides three 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 third is a gate delay…
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GS1-D
The GS1-D is a delay module that provides two types of customisable delay. Based on the PT2399 digital delay IC with a delay from 30ms to 340ms, the standard “delay” mode allows for normal echo/delay effects that can range from a flanger (short delay) to a classic dirty delay. The IC itself is used on…
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TB-FX
The TB-FX Eurorack module is an 8hp effects module that combines both a simple short period delay and gritty overdrive that both compliment the classic 303 tones from the rest of the TB series. EFX1 – Delay Starting with the delay, the module uses the classic chip used in many guitar pedals, the PT2399, which…
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TB-Seq
Module News: 5th Dec 2023 – New firmware available The TB-Seq Eurorack module and integrated MIDI interface in the Ge0synchronous desktop semi-modular synthesisers combine standard MIDI note to CV V/Oct, gate and trigger conversion as well as MIDI to CV clock with configurable PPQN (pulse per quarter note) – both in and out. The module…
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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
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 Attack, Decay, Sustain, Release phases of the envelope which can be triggered either using the manual gate momentary push button,…
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GS1-L
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 use of the BA662 differential op amp circuit, and as discussed on the GS1-A and GS1-F pages, the BA6110 is a suitable replacement. Due to…
Ge0sync Synth 