posted 26 October 2006 06:33            

So this is quite simple question..

I need to time stretch something, a keys line - I know the BPM of the original, but about 4 mins long, so not something I can work out the number of beats on very easiliy. I know the BPM I want the audio to be at

posted 26 October 2006 06:37            

so I will try to build on this , but still, a simple sollution would be very useful

default hz *
(2.82583 s / "Original sample duration /"

(!BPM bpm s * 4)) "Duration of one beat * Nbr beats per bar = duration of one bar"

EDIT:

my sound is 204 s long - by using the above expression, it did make an absolutely insane high frequency sound, but wasn't the desired result... I don't really understand why .. will keep on looking

[This message has been edited by cristian_vogel (edited 26 October 2006).]

LATER EDIT..

of course , as a DJ, I should have known this , but we don't use maths when we are mixing.

The target BPM over the source BPM gives you the frequency ratio, by which you should mulitply the source audio.

So with this target ratio, I can use any method of getting the beats in time, the simplest being multiplying the playback frequency by the ratio.