One thing I sometimes do is have a sequence that mutes everything 
else, plays, than unmutes them when done

so, lets say all of your other seqs  are on channels 1, 2, 3,

the sequence looks like

MS      *1      //      Mute every sequence that starts with an event 
on channel 1
MS      *2      //      " (Wish I had comments in the event list)
MS      *3
...   play some stuff
US      *1
US      *2
US      *3

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