The main thing that will mess you up in a Basecamp is that you’ll need to create a DUPLICATE before you do any editing to a track. Otherwise the edits you make will affect every other instance of that track in every list. As SteveAZ mentioned, the lists only contain pointers to the data. For Mac users be aware that option-copy in Basecamp doesn’t create a duplicate like it does in every other app. This really messed with me and made me hate BC until I finally figured out what was happening.