Maybe i'm wrong, so please correct me if i am, but i think what he's trying to ask is "is the audio distorting somewhere along the path?". For example, back in the analogue domain, if i had a track that the post fader meters said was nowhere near clipping, then inserted a compressor on that track with the output of the compressor too high, the pre fader signal would be show clipping, but i could happily turn the fader down so the post fader meter reading was fine. However, in this case, we would hear the distortion as the single is clipping somewhere along the chain.
In the digital domain, as Ethan Winer discussed a while back (at least, i'm pretty sure it was ethan. again, correct me if i'm wrong), in these scenarios simply turning down the fader would solve the problem (i forget the exact reasoning but, in my head, it was something about only being able to hear the distortion if the output was clipping)