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cheezy1 5th January 2020 09:47 AM

Changing BPM of Audio in Ableton
 
5 Attachment(s)
Hey guys! I'm pretty new to Ableton and also only just started producing, I used Logic for a little bit but then my Mac had wine spilt over it rockout

Anyway, as you can see in the step by step photos, i'm trying to change the bpm of some audio.

I'm producing a Liquid DnB track at 174bpm, therefore I would like the vocals at half the speed (87bpm). When I change the bpm to 87 it actually makes the audio file smaller when surely it should be larger if its slowing the tempo down?

I'm not sure if it shows my photos in order but if they're not then this is what i've done (if you can see the file name it helps, not sure if you can as i'm new to this forum) :-

Shown overall BPM of track
Shown BPM of the audio file when I click on it
Audio file size
Changed BPM
New audio file size

It doesn't sound right either. I'm probably doing omething really stupid, but can anyone point me in the right direction as to how I do this correctly?

Kind Regards
Cheezy1 X

pottering 5th January 2020 07:24 PM

The setting in the Clip is supposed to be the original BPM of the raw audio.

By setting it to 87 you told Live that Clip is 87 BPM, not whatever it auto-detected. Since the Set is set to 174 BPM, Live plays that "87 BPM" audio double speed to match that 174.

If you want it to slow down to 1/2 speed you got to set the Clip BPM to double, not half.

cheezy1 8th January 2020 08:10 PM

Thankyou mate.

cheezy1 8th January 2020 08:52 PM

I'm pretty sure the original BPM of the audio is 80bpm? So how would I make this half time in the clip settings?

Cheers mate, sorry struggling to get my head round ableton.

pottering 8th January 2020 10:08 PM

If you have 80 BPM Audio Clip in a 80 BPM Set, if you set that Clip to double that (160) then it will play 1/2 the speed.

When you see the audio getting shorter when you mess with the Clip's BPM it is speeding up, if it gets longer it is slowing down.

Note that the Clips have ":2" (divide by 2) and "*2" (multiply by 2) buttons under BPM, for easily halving and doubling BPM.

cheezy1 9th January 2020 07:02 PM

Thanks, so if the live set is 174 bpm, but the original track audio track is 80bpm, what would I change the bpm too to half it ?

Sorry to sound so so stupid haha

Mikael B 9th January 2020 09:27 PM

Quote:

Originally Posted by cheezy1 (Post 14438201)
Thanks, so if the live set is 174 bpm, but the original track audio track is 80bpm, what would I change the bpm too to half it ?

Sorry to sound so so stupid haha

The clip bpm should always be the original bpm or an even multiple of it. So if the original is 80.0 bpm, that would be 40 (divided by 2), 160 (multiplied with 2) and so on. I suppose one can experiment with triplet time and values like that. I've occasionally done that within a single bar in (correctly) warped clips.

Once Live has the actual original tempo it will adjust to the set current tempo accordingly.

pottering 9th January 2020 10:26 PM

Quote:

Originally Posted by cheezy1 (Post 14438201)
Thanks, so if the live set is 174 bpm, but the original track audio track is 80bpm, what would I change the bpm too to half it ?


Drop that 80 BPM audio in the 174 BPM Set.


(It may detect it as 160 BPM (double of 80), as it is closer to the Set's BPM.)


Then just click the "*2" button. It will play half-speed.


https://www.ableton.com/en/manual/au...arping-samples

Mikael B 10th January 2020 09:42 AM

Quote:

Originally Posted by pottering (Post 14438796)
Drop that 80 BPM audio in the 174 BPM Set.


(It may detect it as 160 BPM (double of 80), as it is closer to the Set's BPM.)


Then just click the "*2" button. It will play half-speed.


https://www.ableton.com/en/manual/au...arping-samples

I just would like to add that appallingly often Live is just plain off. The only completely reliable way of not having to change the clip bpm, that I've found anyway, is to change the bpm of the set to the same as the clip (if the bpm is known at that point) when dropping that in, then changing back to whatever I was using. Interestingly this is never an issue when converting an audio clip to MIDI. Live gets most timing and tempo nuances quite correctly.

cheezy1 13th January 2020 07:22 PM

Thanks man, still sounds abit out, but I dont wanna pester you for any more advice!

Nice one x

cheezy1 13th January 2020 07:33 PM

I imported the audio again, and when I click on it it says this is the seg bpm is 229.76, not 80 or 160 :(?

pottering 13th January 2020 08:41 PM

I missed you were talking about vocals.

Software can't auto-detect BPM well in vocal stems.

Software relies on clear patterns on the audio to detect BPM, has to have clear notes and drum hits.

With vocals, drones, SFX and other audio that doesn't really have a clear rhythmic pattern, software can't detect a clear rhythmic pattern.

Maybe you should just read the manual:

https://www.ableton.com/en/manual/au...o-and-warping/

Mikael B 14th January 2020 09:08 AM

Quote:

Originally Posted by pottering (Post 14449706)
I missed you were talking about vocals.

Software can't auto-detect BPM well in vocal stems.

Software relies on clear patterns on the audio to detect BPM, has to have clear notes and drum hits.

With vocals, drones, SFX and other audio that doesn't really have a clear rhythmic pattern, software can't detect a clear rhythmic pattern.

Maybe you should just read the manual:

https://www.ableton.com/en/manual/au...o-and-warping/

Considering some text in the name of a scene can trigger a new bpm, then expecting Live to understand for instance "80bpm" in the name of a source file, really shouldn't' be unreasonable. I don't have many loops, but almost all of them have the actual bpm in the name.