Synching to Audio Stream

Question: is there a way to do this that I’m missing?

Once I start the stream, there’s no stopping it, is that correct? And there’s no grabbing the playback head and moving it back and forth over the sound that I might want to use, is that also correct?

All the documentation I have and have found is very rudimentary it seems.

I’m not synching to a button so it’s not an event. What I’m doing is, making a picture appear at 100% at a drumbeat…or is that an event and I’m misconstruing?

Any and all information you guys might have would be appreciated in the extreme.

DeerRaven