Let's say you found a nice synth bass loop and then you start wishing it had some acoustic bass flavor... In the project below I edited out a single note from an acoustic bass loop to add to my synth bass loop. What if you want to treat a combination of two tracks with two independent regions as a single track with a single loop? The solution is to merge them together! Here's how to do it:
Click the Settings menu (1) and select "Merge tracks..." (2). Choose from the list of tracks two or more tracks that you want to merge together and click "Merge" (3). A new track called "Merged" will replace the old tracks (4). The volume of the new track might be a little lower in order to avoid overloading, but you can simply increase the volume with the track's volume control to compensate for this.
Tip: If you want to save a backup of your merged tracks, create duplicates from the track menu before performing the merge.
(2) Settings -> Merge tracks...
(3) Merge tracks dialog (select the tracks you want to merge)
(4) Merged track (replaces the old tracks)