Crackling, clipping sound during play backs/recordings? No tracks are actually clipping..

Hello, I've recently got GarageBand 10.0.2 and imported an old GB file to work with in the new GB.
When i play back the recording it seems i get a crackling, clipping type of sound although no tracks are actually clipping?
i think it may occur when i switch to the new presets but the clipping/popping noises come and go with ever play back.
Any idea?
-Payam

TheodoreG wrote:
A good bit-depth calculation would be useful for verifying the resolution of a recording, especially when it comes from a source that may have done it incorrectly. For example, an unfamiliar combination of hardware, software, and their settings might appear to deliver 24-bit recordings (observed from file size) but in fact deliver upsampled 16-bit audio.
If you end up with a recording that has a sample bit depth size that is the equivalent of 24 bits, you couldn't tell anything about the real source of it anyway - it could be upsampled 8 bit, for all you could tell from those numbers. And that's all it does - takes a guess from the sample depth.
I deal with the audio I get, regardless of what any form of analysis says about it, because generally there's nothing I can do about it anyway. And that's why I don't think there's any value in the information - I treat the audio and save it as 32-bit FP - end of argument!
And, er, exactly which plugins have you discovered that are not giving you back what you sent them, or something better?

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