On the MIDI settings page You'll need to set MIDI=MULTI and SEND=BASE. BASE is the channel the VFX sends MIDI information
out on. With programs like Cubase the SEND channel has to be set to '1' since Cubase redirects this channel to the channel set on a specific track.
Since I own a VFX-SD, I use SONG mode, where each track is then set to recieve on MIDI channels 1-12, and the MIDI channel setting to MIDI, so the VFX-SD
plays incomming MIDI information.
I'm not sure if the vanilla VFX handles tracks in this way, but Your question made me want to download the plain VFX manual.
Best, Claus
AudioSaucer, DK