Octal attenuverter (8HP)

Inspired by:
Octaverter by MMI Modular (among others).

interactive version (top PCB)
interactive version (bottom PCB)

My first exposure to attenuverting mixers was Fonitronik's Cascade, and this is that idea on steroids.

Build notes

The first PCB run directly feeds the +5V normalled offset into the jack switches without protection resistor, so there will be a brief (but harmless) voltage drop when a cable is patched into any input. Not a very easy fix unfortunately, since it involves cutting all 8 traces and kludging in resistors.