bug? Elastique Or Radius for Bouncing Clips?

[sjoens]

I've always used Elastique for bouncing clips with good results until today.  Bouncing should clean up audio distortions.  But today it actually created them. 

4 sec vocal clip before bounce:  audio looks and sounds fine.               after bounce:  audio looks and sounds distorted with popping noises.
   

I tried bouncing this clip with a bigger one with the same results.  I switched to Radius and got much better results.

They each work better for certain tasks - as outlined in the documentation, but none of them should create distortion or artifacts damaging a clip beyond use.  So just wondering what might be going on here.

Edited October 11 by sjoens

[msmcleod]

Radius and Elastique use completely different algorithms to stretch the audio.  There is no better algorithm between the two - one can be better for one type of audio, and the other the better for another.

All stretching algorithms will create artefacts / distortion to some extent - again, the extent of these artefacts will depend on the audio and how much you're stretching.

[sjoens]

Thanks Mark.  This is a 4 sec clip shrunk 65.25%.  Radius worked but I would expect none of them to ruin it. 

[Amberwolf]

Just a data point; probably not relevant:

 

In Ookami no Kari no Yume I use the Radius (Mix Advanced, IIRC) stretching via Ctrl-drag-clipedge on most of the many wolf-sounds within it, some of them by at least as much as 154% longer, or 75% shorter (to help their timing line up better musically), with no significant audible artifacts. (if soloed, I can hear some tiny differences here and there from the unstretched versions, but in the mix it's inaudible, and no one who hadn't heard the originals would likely be able to hear these). Most of the clips are less than a second long, some are a few seconds, and some are as much as nearly half a minute. 

 

I don't have the other algorithm available in my version of SONAR, so don't know what results I'd get with it.  I think I tried all of the available Radius options in the AudioSnap dialog with Mix Advanced giving the best results (not that there was much difference that I recall).

 

 

[sjoens]

In my case it didn't create artifacts but actually damaged and distorted the wave form.  I figure some algorithms have trouble "crunching" the numbers accurately when shrinking short clips like this one.

Edited October 14 by sjoens