oh, i see, well i know which place you are talking about and i was not sure where would be better place to put it, sorry
hm, if you see that pinwheel is rotating and your heard the sound it means that next frame is ready. if you don't see it it might mean that you didn't scroll enough far to open bottom border of the frame (i wanted to prevent animation to start before all frame is visible in case you miss something)
thank a lot for feedback!