Okay, so I've got a problem. I'm experimenting with the 3xOsc. I've got a tune down (It's a Bach invention) and it sounds pretty good. So I export to WAV, and compress to mp3. Now, the problem is that the mp3 sounds bad... even though I'm using VBR. There's a sort of rumbling, knocking sound you can hear while the track plays. I think it's coming from the one channel I have that is acting as the bass. I've tried tweaking it by lowering the volume, adjusting the Oscillators, but it still sounds bad. Any tips?