The LilyPond utility is a text based music typesetting tool that generates professional quality music scores - and exports those scores as playable midi files. Frescobaldi is a GUI LilyPond Music Editor that manages this process for you in parallel open windows.

What this has to do with voice over is that it's an excellent way to write your own jingles or music beds for your voice work products. The opening sounder for this podcast is something I wrote originally in LilyPond, then exported it to midi and eventually to a sound file that is then imported into Audacity.

You'll likely find Frescobaldi a useful addition to your audio toolbox.