Best way to Sync music with images

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spriteman

I have a slideshow running and also music in the background. I am however trying to sync in the changing of the images to the tempo of the track.

Is there any way to keep this in sync.

Presently to control the timing I am using something like,

timer=0

if timer >0 and <1000
Display pic1
if timer >1000 and >2000
Display pic2

timer=timer+1

Not sure if there is any other way really...