After I received my Ciat-Lonbarde Tetrazzi Organ, I spent a lot of time delving into its design.  I wanted to understand it as well as possible in order to be … Read More

Quantity 1 Here is a DIY Mattson Mini Modular VCF in a MOTM panel.  George Mattson’s description: 4-Pole, 24dB/Octave State Variable Filter jointly designed by Synth DIY guru Jim Patchell … Read More

Quantity 2 Tony of Oakley Sound keeps updating his modules.  See here for his latest description of the famous ADSR-VCA. Though I already had four of the earlier revision 2 … Read More

Quantity:  1 Dual VCO This is a circuit of my own, based on the XR-2206 VCO data sheet examples.  Features: Coarse and fine frequency controls Low/High range switch Sine/Triangle switched … Read More

Podcast: Play in new window | Download

A 1U Dual Mixer in matrix configuration This is a DIY mixer designed to save space in a portable cabinet.  It is based on my 2U DIY Matrix Mixer.  The … Read More

Quantity: 0 George Mattson’s description: The 4-Channel gate delay provides four independent gate outputs that are delayed based on the user-controlled time setting after the initial trigger event. The input … Read More

Quantity: 1 George Mattson’s description: The Quad AD/ASR Envelope Generator consists of 4 identical channels. This is designed as a utility module for basic Envelope utilization. Each channel has an … Read More

Quantity: 2 Description: Mattson Mini-Modular Envelope Generator Mattson Mini-Modular VCA I combined the Mattson Envelope Generator and VCA modules into one panel.  Here is George Mattson’s description of the Envelope … Read More

Quantity: 2 Description:  Mattson Mini-Modular Voltage Controlled Mixer Here is a MOTM-ized Mattson VC Mixer!  From the Mattson website: The VC Mixer consists of 4 channels. Each channel has an … Read More

Quantity: 1 Description: Mattson Mini-Modular Quad Buffer I took Mattson’s DIY Quad Buffer board and added four attenuator pots to turn it into a quad buffered attenuator.  I call it … Read More