Hi Owen,

Mixxx uses an external library called SoundTouch to perform
pitch-independent time stretch. I've never noticed the problem you've
described, and I've never seen it reported before. It's possible that
Mixxx is using SoundTouch incorrectly, or that SoundTouch is doing some
processing that's distorting the audio slightly. I know that SoundTouch
applies an anti-aliasing filter to its audio, but I have no idea if
that's the culprit here. 

One thing you can check is trying a SoundTouch test app (one called
soundstretch comes with ST) and comparing a stretched audio file with
that vs. Mixxx. That should you if we botched something in the way we're
using SoundTouch.

Thanks,
Albert

On Wed, 2009-07-22 at 23:08 -0400, Owen Williams wrote:
> I've noticed that, with pitch-independent stretching turned on,
> sometimes high frequency drum hits disappear.  This leads to an ugly
> smooshy "thump" in the bass kick, lacking the normal smack on the high
> end.  This seems to happen once every few measures.  If I change the
> pitch setting to "vinyl" style, the problem goes away.  What is causing
> this problem, and is there any way to fix it?
> 
> thanks,
> Owen
> 
> 
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