SMPTE will just sync the playhead of clips, it won't sync effects. If you build the effects on beat into your clips then SMPTE is the answer.[/quote]
So the video clips will have to be pre-recorded at the same tempo as the backtrack? If the backing tempo changes, even by a fewf BPM, then they will start to go out of sync?
To create the below clip, I looped a kick in ableton into the second soundcard / laptop, on which resolume was running. I set the input on the foreground clip's RGB delay effect to external and brought the kick in, which works great, even with BPM changes. But I guess the aim is 1. to be able to run the entire backing track, which makes the solidity of the RGB bounce more difficult (all other frequencies will play, greatly minimizing the required amplitude range) and 2. to be able to change the tempo without having to resync resolume manually or by using pre-set clip tempos. It may be a little higher grade, but if its at all possible i'd like to base the set's visuals on flexible BPM effect sync - to turn a knob and have the visual pulse slow down - unique (at least in cape town!)
[youtube]
http://youtu.be/lc7WHsamCug[/youtube]
thanks again for all the help!