A-ha! I found it! I did have my recording level set too high. I adjusted the "What U Hear" setting in the Mixer application to 35%. This seems to work for all of my current songs. When I become rich and famous, you can say you helped me get started.
I have been able to save my NWC files as WAV or MP3 using the various suggestions from the message board (WavePad, Creative WaveStudio, etc.) However, that is where my success ends. The resulting sound makes it seem like it is too loud for the speakers - very vibrate-y. (If I can invent a word.) I am not at all savvy when it comes to sound mixing or equalizing or whatever else I might need to adjust. I am using the "what you hear" variety of recording. It's a very basic piano composition, so there's not a lot of fancy stuff going on. I am using the Akai-SteinwayIII SoundFont. It sounds great within Noteworthy. I just can't get that translated out.
Ideas, suggestions? Anyone want to convert my files for me? <grin>