Hi Russell

Thanks for the reply. Can you clarify what you mean by RB/PTW?

I have tried your second idea and seems to work ok. The other way I guess is to record a guitar track, then a vocal track while listening to the guitar on headphones. Then feed the vocal track into the unit and play the guitar again live into the unit so the unit adds harmony and pitch correction to the newly recorded vocal track. The other possibility is to use an electric guitar to feed into the unit while you listen with headphones to the acoustic guitar track. With the volume turned up on the electric guitar the unit can add harmonies, etc but the mic won't pick it up.

Necessity is the mother of invention as they say.

Mick