This effects loop is built to give you greater control of downstream signal processing. It provides a bypass toggle, a wet/dry mix knob, and send & return gain controls. It works with mono, stereo, or poly (flip a switch and jacks become poly jacks) signals. You can modulate the bypass toggle and the mix control, and there are two selectable CV response modes for each (pulse toggle vs gate hold, env vs lfo).
Use this device to test or switch between different effects chains, to push effects into saturation or to regain some headroom, to modulate effects into and out of a signal path, and to do all those things with CV signals too.