trouble with sound

Hi, I'm trying the followng code out (I want to use something similar in a game i'm writing)

ChangeDir "c:\program files\blitzplus\derek\quadblox"
heh = LoadSound("music1.mp3")
LoopSound(heh)
PlaySound(heh)
Graphics 640, 480, 32, 2
While Not(KeyHit(1))
If KeyHit(57) Then PauseChannel(heh)
Wend
End

I've tried StopChannel as well. Neither of these functions stop the background sound from playing. (its a 5 minute mp3).

How can I stop background sound from playing? Or do I simply have to use shorter background music? That would be depressing if so.