I have worked it out!
thanks to Carl for putting me on the right track.
here's how I did it; not very elegant but it works lika a charm:
(D7)
on exitFrame
sprite(the currentSpriteNum).moveableSprite = True
sprite(the currentSpriteNum).constraint = the currentSpriteNum +1
set the volume of sound(1) = (255 - (the locV of the currentSpriteNum -
380)*3)
-- 380 is the top of the constraining track -- *3 is a value arrived by dividing
255 (volume)
--by the total lenght of the track.
end
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