In the Mono quality modes, Stereo spread crossfades between the left and the right
input. Remember that the left input is normalized into the right input, so with nothing
patched in In L, this will have no effect.
Looping Delay: Audio outputs
In the Stereo quality modes, Stereo spread gradually swaps both output channels. Fully
CW, it allows to do ping-pong delay effects: each time the sound is fed back, the two
channels are reversed.