
i just tried this out on jjos2xl on my mpc 1k, i played my sequence then hit mode+trim, and yes you can hear the drum sequence playing while viewing the waveform, you can also adjust the start and end points of that sample, but you cant move the cursor over from chop:off to chop:on in ndc mode, and you cant click f5 to go into destructive chopping either.
i suppose you could make it work if you copied your loop however many times and named them something different then adjusted the start and end points of each of your chops while the sequence was playing in the background.
the reason you would have to name it something different is because in trim mode when you adjust a sample it adjusts the play back of the audio file non-destructively, so for example if you change the start point from 00000 to 000025 when you go back to program mode the mpc will reference where you put your start and end points of that sample and play from 000025 accordingly.
you would be tricking the mpc by copying the same loop and naming it different things each time, so when you adjusted the start and end points, it would work because it would only be referencing that particular sample.
it seems like a weird way to work, why do you want to do this exactly?
cant you just chop in ndc or destructive chopping mode like everyone else? why do you need to hear the drum beat in the background? you know that if your chops dont match up exactly when your done chopping in destructive mode, you can use loop mode or timestretch so all your samples mesh together nicely even if they arent perfect.
if you want to play your beat slower than the original sample tempo, most of the time you have to use loop mode or timestretch anyway because the band didnt play everything 100% on time.
on the other hand if you play it faster and set up your mute groups correctly then most times the listener, you included, would be hard pressed to tell that your sample didnt stop or start in the exact right place. after you get the hang of chopping, it usually just works, and thats the beauty of sampling. we have all these great tools at our disposal to remix something, all you have to do is take the time to learn how to use them.

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