If I'm reading you right, I think you just want to hold Alt+Shift when soloing the tracks(s). All currently selected tracks will be soloed. You can also make a group of the selected tracks. Making a bunch of groups is handy because you can click the little icon to the left of the group and it will select all the tracks in the group without turning the group on. You can then shift click other groups to select and deselect there tracks. Hopefully I read you right, Ter