Boss VF-1 Effect Processor

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>From manual:
>"Input an instrumental sound into the left channel, and a voice
>into the right channel".
>Instrumental sound: guitar, synth, cd-player, anything ?

Thats all possible I think, I did my Synth,don't forget to push a key.

>A voice in the right channel:   voice = ? a microphone ?

Yes that's what I did, start talking/singing, your voice triggers the sound
(at least that's what I remember, almost never use it)