This is a manually controlled bandpass filter module. In addition to the normal controls for frequency and resonance, there is a control for blending the filter's output back in with it's input to give a finer degree of control over the sound. This is combined with a phase reversal switch for the filter's output which allows for notch-like outputs when combined with the blend control.

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.