how do i sequence a chain of events?

[shintashi]

I'm trying to set up a series of sound effects and weather in an order based on frames, but I don't think I know what I'm doing. I add them, but it seems like they play all at once, the waits don't overlap right, some stuff doesn't even seem to happen, and it looks terrible.

If I wanted to play 3 sound effects, and 3 visual effects with sound overlapping visual (like flashes), what would I have to do?

I originally thought it was like (pseudo code below)

wait 20
play sound 20
flash screen 10
wait 20
play sound 20
flash screen 10
wait 20
play sound 20
flash screen 10


totals 60 frames... but I'm sure I'm wrong about that.