In a list of 11 tracks I want to select groups of 3-5 tracks
to mix and render to new track. If tracks are
directly above each other dragging the pointer
over the tracks with left mouse key and then shift-m
works. But how can I select for instance the top one
plus bottom one.
Found it 
Here is the answer if anyone else needs it How do I extend or move the selected region into other tracks?
Gale