Ableton Forum

How can I quantize samples?

I'm in session view and I'll record a long audio sample (maybe a few minutes long), and then I want to crop a few seconds of that sample and loop it, and build from there. Ableton doesn't know the BPM of this cropped sample (nor do I), the global tempo remains at 120. So if I record additional clips, they're quantized according to the global settings and not in sync with that first cropped sample.

Is there a way of letting Ableton know, for example, this cropped sample's time signature is 5/4 (so if its 5 seconds long, each beat must be one second). So that each subsequent clip will follow that first sample's tempo? I'm sure there's a way to do this but I can't figure it out.

Thanks.

You can enter the time signature in the clip properties box.

But changing the time signature in the clip properties box doesn't seem to actually change how Ableton measures a beat within that one sample. It seems to still follow the global tempo. In fact, I'm pretty sure the little help box in the bottom left corner says the time signature is "for reference only" and doesn't affect how the clip is played.

You can change the global time signature in the upper right hand corner of Live then:



Right where it says 4 / 4.

Even with the global time signature adjusted, Live still was not correctly interpreting the sample. I think because the global BPM was still 120. So for example, it would treat a sample that was 1-bar of 5/4 as if it contained 7 beats.

I think I figured out one way of fixing this: by telling Live to warp the sample as a 1-bar loop. This works well for smaller samples (subsequent clips are in sync with that first cropped sample). But once the sample gets long, and I'm warping 4 to 8 bars, the rhythmic structure seems to break down, and the subsequent clips are not in sync.

Going over the manual, it looks like adding warp markers might fix this, by telling Live roughly where each beat occurs. I'm still a little fuzzy on how to use the warp markers, but I'll try messing around with them...