HELP Turn off MusicOnHold

What I want to do is start musiconhold, then with php im going to be compiling some data and when its all done, I want to turn off the music and continue on…

extern s,1,MusicOnHold(default);
… compiling data…
extern s,20,Turn_Off_MusicOnHold;
extern s,21,…continue…

How can I do this, I can’t figure this out at all… I don’t want to set a timelimit with WaitMusicOnHold because compiling the data is random, there could be no data to compile or there could be a lot of data, so there is no telling how long it will take. I just want background music to play on the phone while its compiling…

Please help,
Thanks,
~Div

Please please please please help =(

Anyone =( ??