When you get a chance check a SmoothSwingV2 font when you have Track playing before you turn on the Saber. I find the Track is playing, saber turns on ( but hum isn't activated until you start moving the saber. Also when turning the saber off the Music stops playing and the amplifier is turned off, unlike in monophonic fonts where the Track will keep playing. cheers
I modified the StartOrStopTrack function to force to use wav player Unit 5, this seems to fix it for now. I assume that Polyphinc fonts utilise wav player Unit 0 and hence when music is playing before the Saber is turned on it allocates this player unit 0 to the track, then issue arises when Saber turns on. Moving it to Unit player 5 keeps the Track player fixed and 'out fo the way', everything else seems to work fine now. Cheers.