Anyway, about these durations:

(p)(q) is the easy one. The audio system latency, the time it takes your audio driver and soundcard to process the samples and present them as sound on the soundcard’s audio output. This is just a simple calculation: You need two values: The position property of the flash.events.SampleDataEvent that is passed to your SampleData event listener and the position property of flash.media.SoundChannel object that was returned by the play() method of your flash.media.Sound object. Then it’s this calculation: ((sampleDataEventInstance.position / 44.1) – soundChannelInstance.position). See Adobe’s SampleDataEvent reference.

(a)(p) is internal to your Flash application: SampleDataEvents are received at regular intervals. But if you have calculated when a sound has to start playback it would be a coincidence that that starttime would be the exact moment, on the millisecond, that a sampledata event is received. More likely the sound should start somewhere in between. The duration (a)(p) is that time difference. So if the sound you want to play should start somewhere between the current and the next sampledata event then the first sample of the sound should not be on position zero of the buffer but on position (a)(p).

Hope this helps, Maybe a clearer answer can be found elsewhere.

I am working on the sample no. 1, animation follows audio. But can you explain further on the technical code on how to write this? I am a bit lost in getting the duration (a)(p) plus duration (p)(q).

:/