Frap Tools 321

The 321 is a multi-purpose utility module for high-quality audio and CV processing.

It consists of three sections, each capable of scaling a signal, inverting it, and adding a positive or negative offset.

The signals feed two summing stages: one for all the sections and another that excludes from the sum those sections whose output socked has a plugged cable.

It can process both CV and audio signals: the sum borrows its design from our popular CGM series and guarantees transparent amplification and sum, with two -6 dB switched to attenuate the summed signal and gain extra headroom.

When nothing is patched, each section can output a plain DC offset.