| Audio signals | Control signals | Description |
|---|
| Single input single output stereo-mono | n/a | Mono output equals left channel input minus right channel input |
| Single input single output stereo-stereo | n/a | Left channel output equals left channel input plus right channel input; right channel output equals left channel input minus right channel input |
| Double input single output mono-mono | n/a | Mono output equals first mono input minus second mono input |
| Double input single output mono-stereo | n/a | Both stereo output channels equal first mono input minus second mono input |
