clipping sound in edited audio files

I've been using ableton recently and I've been editing the audio files in audacity and cool edit but every time I edit a file the edited file has a kind of clipping noise on it.



I'm not sure if the audio is actually clipping or if it's just a noise that seems to appear every time I play the file.



I don't know if it will be audible when I record a mix down.



Does anyone know what this problem is or how to fix it?



Thanks.

clipping sound in edited audio files