Does anyone use the AVOX Harmony Engine plug-in? I'm totally baffled by how to properly route the thing.
 
Apparently, this plug-in has to be routed to an audio track, not a MIDI track. I have a vocal of the melody and wish to send 3 harmony tracks (via MIDI) into the plug-in so that the end result is 4-part harmony. Sounds easy but I can't get it to work.