
Inputs are the left and right channels of the track, so you have to do some routing if signals come from different tracks (easy in Reaper). The second input can be switched to the internal OSC, which can be controlled via slider or MIDI. Waveform of the OSC can be changed.
MP3-demo: http://music.service-1.de/ringmodulatordemo.mp3
( clean, then mixed/processed )


