Using the forever block. I used this for my Pokemon game and Guitar Tuner:
[blocks]<forever>[/blocks]
[blocks]<if><( <{ Sound }> <=> 0 )>[/blocks]
[blocks]<play sound[ Sound until done[/blocks]
[blocks]<end>[/blocks]
[blocks]<end>[/blocks]
And it will set the variable to one when you want it to (make sure you reset it though when green flag clicked )
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