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making a sound unrecognizable

Dear list members,

I'm looking for a possibility to change/edit a environmental or at least natural sound in a way that it is not any longer recognizable as what it is, but, however, for doing this with changing as less acoustic parameters as possible. ;-) The intention is to use these sounds in a MMN paradigm and it is important that both "versions" of the sound are acoustically as similar as possible.
The main point is that the sound (that can also be a more complex thing as the sound of a barking dog or a something like that) should be not possible to be recognized as what it is.

I would be very happy about ideas or would like know if maybe somebody has already tried something like this? I would also be very happy about recommations for software or matlab scripts that could be helpful in respect to this. For example I'm looking for a way to transfer the amplitude envelope from one sound to another (I already wrote a matlab routine for this, but its not yet functioning perfectly fine and the result is not completely convincing).

So if anybody has a an idea I would be grateful.

best regards and thanks a lot,
Ursula Kirmse

Ursula Kirmse
University of Leipzig
Cognitive & Biological Psychology
Institute of Psychology I
Seeburgstrasse 14-20
04103 Leipzig, Germany
Phone +493419735978/Fax +493419735969