bitSync
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Compensatory Slip Stretching Adjoining Audio Clips? (Solved)
I have a section of audio in which I would like to delay the occurrence of an audio event appearing in 6 related audio tracks. The time immediately preceeding the event must expand and the time immediately following it must compress, all without unwanted pitch artifacts, of course. To set it up I'm envisioning three splits, (#1) one beat before the event (which was performed on time), (#2) at the onset of the event (which was performed too early), and (#3) one beat after the event (which was performed on time). I'd like to be able to make the splits and then sit my cursor atop the middle split, split #2, and adjust it forward and back in time to place the event exactly where I want it time-wise by simultaneously compressing and expanding the two adjoining split clip stacks, so essentially just moving the middle split position around until the event position at split #2 is where I want it. This adjoining clip slip stretch must be performed simultaneously and identically across 6 related audio tracks - 2 acoustic guitars, each with mic L, mic R, and direct piezo. Can I perform this operation concurrently on both of the adjoining audio clip track stacks (6 before and 6 after) by sitting the cursor on the middle split and moving it left and right? Or must I independently lengthen (slip stretch expand) the 'before' clip stack and shorten (slip stretch compress) the 'after' clip stack, then fiddle with crossfades to rejoin smoothly? Sorry if this is a stupid question; I've never tried this before and I couldn't find anything in the manual about concurrently slip stretching adjoining clips. Or, is there a better way? Thanks.
post edited by bitSync - 2014/08/28 22:20:39
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scook
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Re: Compensatory Slip Stretching Adjoining Audio Clips?
2014/08/27 16:03:49
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Try selecting the clips and group them using Clips > Create Clip selection group from the track view menu. Then perform the needed edits.
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bitSync
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Re: Compensatory Slip Stretching Adjoining Audio Clips?
2014/08/27 16:18:31
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scook
Try selecting the clips and group them using Clips > Create Clip selection group from the track view menu. Then perform the needed edits.
So, once grouped, I can concurrently lengthen (expand) one group while shortening (compressing) the adjoining one?
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Anderton
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Re: Compensatory Slip Stretching Adjoining Audio Clips?
2014/08/27 17:41:43
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☄ Helpfulby bitSync 2014/08/28 10:11:39
bitSync
scook
Try selecting the clips and group them using Clips > Create Clip selection group from the track view menu. Then perform the needed edits.
So, once grouped, I can concurrently lengthen (expand) one group while shortening (compressing) the adjoining one?
I'm pretty sure that unlike slip-editing, the timing tool works on only one clip at a time. However, I think there's a fairly simple and precise way to do what you want. This sounds a lot more complicated than it is only because I'm trying to be clear with the instructions. I'm assuming the clips are of equal length, and you want the compressed ones to compress by the same amount and the expanded ones to expand by the same amount. Your idea of where to put the split points is correct. With snap off, on one of the tracks, click the timing tool on the left edge of the clip that needs to be shortened, then drag right so it's compressed to exactly the right length. Now choose Edit > Preferences > Customization > Snap to Grid and uncheck all landmarks except Clips. In the Control Bar's quantization module, set the snap to something large, like a measure or 30 seconds or whatever, so the normal snap "gets out of the way." Then enable snap and click the Marks button. The timing tool will now use the correctly stretched clip as the reference for snapping. Click the timing tool on the left edge of the clip below the correct one, and drag right. Its beginning will snap to the beginning of the reference clip. Do this for the other clips that need to be compressed. For the clips that need to be expanded, click the timing tool on the right edge of the clip and drag right. It will snap up to the beginning of the correctly stretched clip. Do the same thing for the remaining clips. If you hear a click at the splice point, revert to the standard editing tool and create a very short equal power crossfade where the expanded and compressed clips meet. Don't forget to bounce each clip to itself to invoke the high-quality offline stretching algorithm.
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bitSync
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Re: Compensatory Slip Stretching Adjoining Audio Clips?
2014/08/28 10:18:34
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Anderton
I'm pretty sure that unlike slip-editing, the timing tool works on only one clip at a time.
So this kills the original multitrack temporal editing idea, but we've talked before about cat skinning... Anderton
However, I think there's a fairly simple and precise way to do what you want. This sounds a lot more complicated than it is only because I'm trying to be clear with the instructions.
I'm assuming the clips are of equal length, and you want the compressed ones to compress by the same amount and the expanded ones to expand by the same amount.
For the clip stacks across the 6 tracks, each of the clips is identical in duration and has identical start and stop times, and the 'before' clip stack end immediately adjoins the 'after' clip stack begining. However, the 'before' clip stack and the 'after' clip stack may have similar durations to each other but they will not be identical. The adjoining 2 clip stacks total duration will be roughly 2 beats in duration (3 beats with 2 intervals). The middle split will be somewhat earlier than halfway between the 2 end splits since it will be at the start of the undesirably early audio event. You are spot on when you suggest that the tracks to be compressed must be compressed by an identical amount, same goes for the tracks to be expanded. Anderton
Your idea of where to put the split points is correct. With snap off, on one of the tracks, click the timing tool on the left edge of the clip that needs to be shortened, then drag right so it's compressed to exactly the right length.
Mute the other 5 tracks, I'm thinking. So, if I understand correctly, this action establishes the temporal reference point for where we want the undesirably early audio to be, that is, a little bit later than where it is now (FYI we're talking maybe 150 msec on a 73 BPM track). We're moving the begining of the 'after' clip, 1 of the 6 clips in the clip stack, to where we actually want the audio event to happen. Anderton
Now choose Edit > Preferences > Customization > Snap to Grid and uncheck all landmarks except Clips. In the Control Bar's quantization module, set the snap to something large, like a measure or 30 seconds or whatever, so the normal snap "gets out of the way." Then enable snap and click the Marks button.
The timing tool will now use the correctly stretched clip as the reference for snapping. Click the timing tool on the left edge of the clip below the correct one, and drag right. Its beginning will snap to the beginning of the reference clip. Do this for the other clips that need to be compressed.
OK then, so we're lining up (time compressing) the 5 other 'after' clips start to precsely where we established start should be using the reference clip above. Got it. Anderton
For the clips that need to be expanded, click the timing tool on the right edge of the clip and drag right. It will snap up to the beginning of the correctly stretched clip. Do the same thing for the remaining clips.
If you hear a click at the splice point, revert to the standard editing tool and create a very short equal power crossfade where the expanded and compressed clips meet.
Don't forget to bounce each clip to itself to invoke the high-quality offline stretching algorithm.
Very cool. I won't get a chance until later to try this but I'm looking forward to trying it out. Thank for the suggestion, Craig. This is very helpful.
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bitSync
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Re: Compensatory Slip Stretching Adjoining Audio Clips?
2014/08/28 22:26:52
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This worked out beautifully. Thanks.
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Anderton
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Re: Compensatory Slip Stretching Adjoining Audio Clips?
2014/08/28 22:38:06
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My pleasure, always glad to help.
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