My current band (still in the embryonic stage) will use a drum machine so we know the exact BPM for each song ahead of time. What I want to do is something like this, for a live performance: - Play and record a verse rhythm part. - Loop it and play the verse lead part over it. - Turn it off during the chorus. - Start the loop again during the next verse and again play the lead line over it 'live'. So I understand I need a looper with quantize to do this. Does the quantize stretch the recorded loop or just make the loop length end at the closest beat/bar? I don't really want anything stretched. Is it possible to preset the loop BPM and length so it will end the recording automatically? I think starting the loop off with a manual switch will be accurate enough, but is there the option of switching using an external clock signal? (MIDI controlled perhaps?) Can I record multiple separate loops which can then be triggered separately or together? How many? If I recall correctly, some loopers allow you to overdub the loops as many times as you like with the option of switching the last overdub on/off. Is there anything more powerful than this? Thanks for your help!