[PhiBee]

Me too, I always use a aux and a send (usually rather two, because I use 2 reverbs especially when your character moves from one space to another); I automate the mute or level of this send (on the track - or tracks - that I want to deal with at particular timecode). I must add that personaly, the send are always to +/-0dB and playing with the retour level (aux level) and only the send mute.

And also always have one (or more) track with a specific fx (or more extreme), on which I move the clips that I want to be processed.