• SONAR
  • How to use audio snap in 8.3 to change the tempo of an audio file???
2012/09/20 09:08:45
Iron Keys
Been searching all over the net, I only seem to find how to get the audio to change with the project tempo and in 8.5, I'm using 8.3 so I don't believe I have the same audiosnap box as 8.5...?


Anyone can help me with this???I'm sure it must be pretty simple, but I desperately need to slow this audio about 3-4bpm.
 
Will slowing it down in Sonar maintain the audio's original pitch/key?
 
Thanks
2012/09/20 09:43:17
bvideo
Here's an extract from the manual for 8 (8.3) (after selecting all the clips and enabling audiosnap): "5. With all clips still selected, enable the Auto Stretch button in the AudioSnap palette. All the clips display the Auto Stretch icon, and will now conform to any new or future tempo changes." (The buttons are illustrated in the manual.) You can then change the tempo at the beginning or at any places on the timeline. Pitch is preserved. Best quality is had by selecting an offline algorithm and bouncing the clips. The same info is probably in "help". Small and even medium-sized changes come out pretty good.
2012/09/20 10:03:07
Iron Keys
Major thanks for the help there!

Is there any way I can just chop the audio clip and edit individual parts without messing up my whole project by constantly changing the project tempo?

2012/09/20 10:27:26
Iron Keys
I'm going to try do this using groove clips instead, i clicked enable groove clip or something, but it wont let me enable stretching (which is how you change the tempo, right?)
2012/09/20 10:32:28
bvideo
Instead of using audiosnap? Maybe you want to chop the clip and use the Process-Length or Process-Fit to Time command on the individual pieces.
2012/09/20 12:12:26
Iron Keys
What I'm doing now... which seems to be closest I've found to what I want to do, is this...

chop audio stems into 4 or 8 bar clips.
Enable groove looping. (Sonar gives its own idea of the original audio bpm (seems quite accurate)
Un-enable groove looping. (*)
Enable stretching. (*Sonar sets the clips tempo to project tempo)
Type in the bpm it gave me previously in step 2.
Audio's tempo appears to be roughly adjusted 'on time' to project.

Some bits fall a little off, whether that's down to the musicians or Sonar. But it seems to be getting close enough.

If there's an easier way I'd love to hear.
2012/09/20 15:27:11
bvideo
I probably need to understand better what your over all objective was. If you just had one clip and you needed to slow it down a little, you didn't need audiosnap or chopping. You could just use the Process-Length or Process-Fit to Time command on the whole clip. Same if you are fitting a straight tempo clip to a slightly slower straight tempo existing project. If you were fitting a clip into an existing project and the tempos vary too much, then chopping at the audio's various phrase boundaries might be a good first start. But I think Process-Fit to Time might have been an easier way to treat the chopped up pieces. Then ideally, when your clip's beats are "close" to the project's beats, that's when you can use audiosnap to quantize the clip to the project's beats.
2012/09/20 15:41:06
Iron Keys
Basically, my project tempo is straight unchanging at about 130bpm

The original song's audio seems to vary between 128-134, but certain sections of 4-8 bars seem to have a more consistent tempo before changing (though some bits may go a bit offtime)

So I've been chopping the different parts, and adjusting them to meet the 130bpm of my project.

So basically chopping up a 3 minute song into lots of 4 (or 8) bar sections, then adjusting the tempo of those sectons to match.

Hope this clarifies.
2012/09/20 17:45:48
bvideo
Then maybe "Process-Fit to Time" might have been an easier way to treat your chopped up pieces. Then ideally, when your clip's beats are "close" to the project's beats, that's when you can use audiosnap to quantize the clip to the project's beats. [] There is a different way to use audiosnap across the whole clip to coerce the detected transients to line up to your project's beats by moving them by hand. It's more "elegant", but I don't know that it would be easier or more reliable than "chop then fit to time" probably is.
2012/09/20 18:29:50
Iron Keys
If I just chop the clip and say 'process-fit to time', how's it going to know what to do with the audio?

I haven't seen this option or button yet anyway...?
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