if then else

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Rook Zimbabwe

I have music in my game and I wanted the user to be able to toggle it off and on so I wrote this:

If KeyHit (50)=True And musicflag = 0 Then musicflag = .5 Else musicflag = 0

Now the music is playing on a channel and musicflag is the volume represented here:

ChannelVolume play_annoy,musicflag

play_annoy is the music channel. The music loops because in the front of the program I loaded it as:

Global annoy=LoadSound("media/heroloop1.ogg")
LoopSound annoy
play_annoy=PlaySound(annoy)

I can't make this work... it never comes on except for a brief splash as the program starts.

What am I doing wrong?