This is a very cool feature for creating quick loops, and while it's playing in record mode, you can then build on those loops by playing another passage over it, and it retains and plays back everything you play up to the available polyphony. I have no other synth that can do this!

It beats the hell out of the 1-track sequencer on my Roland JX10, where it is very difficult to get a perfectly-timed loop because there's no metronome to follow. On the M1, you can either have an audible metronome, or turn it off and follow the blinking light. Erasing what you just did is a little bit of a pain - you have to hold down the Erase button for the length of the sequence, and it will go away so you can start over again if you make a mistake.

I find the M1's real-time sequencer very useful for getting quick and dirty loops going without having to fire up my laptop. And even then, my laptop based sequencer can't do these quick loops without going thru a bunch of menu commands, which is not good for gigging. The M1's real-time sequencer is great for gigs! You can create your loops right on the spot and not cheat by having to create them in advance. I think Joe Zawinul still uses the M1 just for this unique feature. Great work, Korg!