There are more security holes in Quicktime than there are holes in a Swiss cheese. (PSA: If you’re on the Windows platform, you should update to 7.6.9 ASAP, otherwise you’re subject to no less than fifteen vulnerabilities.)
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no, I don’t understand why, using something that is not controlled by yourself.[/quote]
I think they’re using it to save $$$ (by using the external Quicktime, they don’t have to pay licensing fees. If they used something internal instead, they’d have to pay license fees for usage of the codec as Ableton is a commercial product and MP3 is patent-protected until ~2017.