I've done something similar to switch between my Scoreboard CG and the Player Name CG. First you need to name your DSK source inputs in the switcher. I named them CGScore and CGNames. Then you need to drop code similar to this in a toasterscript file in the user scripts for the switcher module.
CreateShortCut( "YOURSHORTCUTKEYHERE" code(
SetDSKByName(NAMEOFSOURCE)
) "Always" 2000)
We also created one to switch to the preview source and change DSK sources at the same time. I can't remember if the DSK command came before or after the SetDSK to get a clean transition, but it was something like this:
CreateShortCut( "YOURSHORTCUTKEYHERE" code(
SetDSKByName(NAMEOFSOURCE)
Take()
) "Always" 2000)
We mapped these to a ShuttlePro, since all our Nostromo keys are used and we are using the ShuttlePro to extend the RS-8 preview selectors to 12 inputs along with a few other added functions.
Kris