Are they all of the same sample rate. If one is 44.1khz and another is 48kHz, or 96 or whatever, then when they come out saved as one individual file, maybe it stretches them so that they are read the same. Does this make sense. It's hard to explain. Just check that when you record them, they are the same.

(I'm talking about wav. files by the way, not mp3s).

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1 out of every 4 people in this country are mentally disturbed. Look at your 3 closest friends. If they seem okay, then you're the one.

damn that sounded like it was the problem, but i check and the offending tracks are both 44.100

thanx anyway though

Sounds really weird... I've done loads and loads of mixes with Acid buy it's never happened to me...

What version are you using?

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Latest releases:
Endless Cycles [Capital Heaven]
The Charlatan [Morphosis]

ACID Pro 4.0

i bet its something simple, im meeting up with a friend who is a pro at it on friday so ill see how it goes.. i might just scrap the mix and start again