Merge tracks

Here are a few simple steps: 

1. Click the Settings menu and select Merge tracks
   
   
2. Choose from the list of tracks two or more tracks that you want to merge together and click Merge. You can also select only one track and then click Merge. This will merge the track into itself.
   
   
3. A new track called "Merged" will replace the old tracks
   

The volume of the new track might be a little lower in order to avoid overloading, but you can simply increase the volume to compensate. 

Tip: If you want to save a backup of your merged tracks, create duplicates from the track menu before performing the merge.