Hello Guitarhacker,

Thank you for your continued support. I welcome all suggestions. People work in different ways, and use what's best for them. I must say though, using the envelopes does seem to be an easy and less destructive way that copying and pasting.

yes, it is.

I believe I would have solved this problem the same way Herb suggested - with a volume envelope.  Cutting it out would work provided that the signals you wanted ( (the uncut sections) remain exactly where they are. 

Using a side chain compression to duck a second Track is very effective when you have many instances where you need  many and more instantaneous muting of a Track.