Why Use a Notation Program to Make MP3 Files?
If you were talking about Finale, I would agree with you. I entered keystrokes for two hymnals in Finale, and never figured out from their 600 page manual how to make them look right on the page - the person I was working for had to do the finishing touches. Sometimes in Noteworthy Composer, you'll run into a combination of notes that don't look quite right, but if you're using it essentially as a midi track sequencer, it's pretty easy to get around, you can manipulate dynamics, tempo and futz with articulation using familiar notation symbols (for the curious, the last 3 tracks here show the results of my manipulation). I capture my Noteworthy Composer files directly from Hauptwerk or other sample playing software, sometimes add reverberation using n-Track Studio and SIR, then trim/convert to MP3 with GoldWave v. 5.67. It also works great with a MIDI pipe organ.