I'd like to second the third comment above. I had planned to use Rosco Keystroke to accomplish this task, but it doesn't work with Intel Macs yet.

It would be great if Richard was reserving those first four channels of DMX on the Preset Trigger - 1 Channel for this purpose.

I know it is possible to use Midi Show Control Go commands to accomplish this, but I always find midi to be a messy control method in the theatre lighting world.

Kevin