Mark, I do not have immediate access to an Oscilloscope, but I can look for one anyway. I should be able to, eventually. Or, I'll be happy to use the sw you andy are recommending.

Also, more info:
I compared audio output between my iPod and my gf Shuffle from a coumple of years ago. Impressive difference in volume, and, less ackground noise. The Shuffle sounds really great. And, my gf agrees with my findings. I did not tell her which player she was listening to, and actually all she knes is that one sounded louder. She added that the louder one also sounded "deeper".