i need a solution to lock playbacks among themselves on the on-screen playback
If I create 6 playbacks , i wish to make 2 groups of 3.
First group : play back 1 / playback 2 / playback 3
2nd group : playback A / playback B / playback C


I want play only 1 playback of each group simultaneously and if i choose another playback into the same group, the first one will be stopped.
For example :
playback 1 AND playback B launched then i select playback 3 AND don't change playback B.
Actually i must to stopped playback 1 manually after select/launch playback 3.
Is it possible ?
I try with key profiles, don't find a solution. Priority parameters don't work either.
Thanks a lot
Eddy