[PD] Active/deactive gemheads

[Donal Carey]

Hi

I'm currently building a VJ type patch and have run into a bit of 
difficulty. I have three [gemheads] connected to three sets of pics and 
videos and basically what I want to do is if any one of the 3 gem-heads is 
active the other two must be deactive so there would have to be some sort of 
mechanism to check if either of the other two gem-heads were active and if 
so deactivate them. Any suggestions would be much appreciated.

Thanks and regards
Donal