I was gifted a number of multi-effects units, some functioning with noise, others beyond repair. I decided to circuit bend them in the hope that some colourful noises would be produced during play. Each of the circuits produced some sounds which had the potential to be modified with extra controls.
Being able to adjust the gain in the feedback loop between input and output gives some control over the sound, but the ability to predict with accuracy what sound will be produced is restricted.
The first three companion boxes all used banana jack modular patching.
Companion boxes four to seven had a reduced interface. One knob and two momentary push buttons.
How-to / instructable