Figured out the pitch shift. The Groove Armada song we played was recorded at 48kHz. I won't go into the technical details of the recording rig for the show, but the short version is that WinAmp and CuBase share a Layla Echo (an older version of this thing) So when WinAmp started playing at 48kHz, the whole Layla switch sample rates, but CuBase didn't notice, so it was still recording data as if it was getting it at 44.1kHz. The same amount of data covered a shorter amount of time, so it got slowed down, thus the pitch drop.
So. Mental note, make sure that _ALL_ songs are recorded at the same rate, or else add YET ANOTHER sound card to my system so that everything can have its own. Or, somehow make Jack work in Windows.
Anyway. I wanted to apologize for this, and make sure y'all realize that Groove Armada doesn't sound like that.