IT file doesn't play correctly

[whiplash]

This song (which came from an SNES game, converted using OpenSPC) doesn't sound quite right when played backing using this library. Here it is on real hardware: [WAV] and here's the file: [IT]

Can you hear it? It seems that the pitch shifting commands are not as accurate as they could be...

[whiplash]

(Sorry for the double post, not allowed to edit my own posts apparently)
If you want to really hear a big difference, just listen to this one (like in the OP, the wav file is recorded off of real hardware): [WAV] [IT]