no, this is not about that sh**ty boys band ;]
How to sync animation with music regardless of frame rate? Sometimes I get full 40 f/s but when its a bit off - we are talking about 1 frame - whole effect disappears. Whole site is quite dynamic, AS has to do lots of “thinking” and sometimes frame rate skips a beat.
Music in flash is my weak point 
as the French say “muchos gracias” for any help.
