I tried asking this question some time ago but was unsuccessful. Basically, many of my RG (volume leveled) tracks exhibit severe distortion in MM4. Here are the details:
Files were volume tagged with MM.
Files do not distort using any other RG-enabled software, including winamp and a host of handhelds.
Problem has been replicated across a myriad of machines, with fresh MM installs. However, some tracks that were previously problematic sometimes aren't, and vice-versa.
Problem persists regardless of output plug or audio hardware.
Files are track-gained to 92db (for shuffling). Hardly a loud setting. Many of these songs are modern and don't clip at the original 102db or whatever, but do when the volume is actually lowered. Files are all FLAC.
Again, this problem is only evident in MM, and nowhere else. I'm a lifetime license holder and will keep using MM for management, but I really hate having to fire up another application just to do the most basic thing - listen to my tunes!