A 3.5mm jack socket wouldn't be a problem. Files in order wouldn't be a problem. Correct ins, the same. But some outs have to be done live, either as snap cuts or fades, the timing depending on the actor's performance. That isn't possible, unfortunately: the actor wouldn't be able to guarantee consistent timing and I won't ask him to regulate his pacing to match pre-recorded adjustments. Ah, but I'm not the performer, or even likely to be there. Many thanks for your thoughts. That's excellent; I imagined that Mac software required a different format for audio files. I'll look at the software. Many thanks.