This is a percussive voice module with noise source, envelope generator, VCA and state variable VCF. Together these parts can be used to make percussive sounds, but patch points are available to use the parts individually, the pure noise signal can be patched out, the VCF or VCA can process outside signals or and the envelope generator’s output can be patched to other modules.

The PCB is available in two versions to accomodate DIP or SMD versions of the LM13700.  The SMD chips are easier to find and cheaper these days.

Demos, build documentation, drill guide, are available here.

Unfinished panels are drilled by hand in my garage, they are bare aluminum that may be scratched.  They are intended to be painted, etched or otherwise finished later.

Pre-Assembled Modules are built after the order comes in.  Build time can be a few days or a few weeks depending on what parts I have on hand.  When ordering, please leave a comment at checkout if you have preferences on what color(s) the panel is painted.