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Description This module is a replica of the Roland 131 module from the System 100M of 1978. It is a four channel AC coupled mixer intended for mixing 10V ptp audio signals into a stereo outputs. The mixer can be used as a final stage before...

Description This is a set of two identical CV mixers in one module, with 4x inputs each, and non-inverted and inverted outputs. Each input has its own jack socket and slide potentiometer. There are also two precision preset voltages controlled by slide potentiometers, providing 0 to...

Description When Roland developed the System 100M they created a Dual VCA module (130), with an AC coupled signal path. Replicas of the 130  module cannot be used for adjusting the level of CV signals, so we have created a dual VCA that is DC...

Description This module contains two independent State Variable Filters with three filter modes available concurrently; high pass, band pass, low pass. Each filter type has its own output.  Each SVF has three audio inputs, two frequency cutoff CV inputs, one resonance CV input. Tall trimmer potentiometer adjusting...

Description This module is inspired by the 173 module in the original 100M. There are the same four signal gates, now transformed into a sequential switch. Each gate can be: ON, a preview mode Controlled by the gate inputs Controlled by the sequential clock The frequency of the internal clock...

Description This module is a re-imagining of the Roland prototype from 1978, which combined a traditional VCO and VCF. The new design is based on modern Coolaudio chips; the V3340 and the V2044, which create many new sounds. The VCO has three waveforms; triangle, sawtooth and...

Description This module is a VCO based on the triangle core SSI2131 chip, which provides an accurate triangle wavform even at low frequencies. Sawtooth, pulse and sine waves have been generated by this core which can be mixed and manipulated in the Waveshaper section. The oscillator...

Description This module is an accurate replica of the original Roland module, with all the features retained including MPX control of a second portamento timing and voltage control of portamento time The amount of portamento applied to the signal input is set by the sum of the...

Description This module is a replica of the Roland 141 prototype of 1978. It contains an ADSR envelope generator, a Gate Delay and an Inverter Adder. The envelope generator has been carefully translated to Eurorack; with the correct attack curve, 2Meg log slide potentiometers and the...