Both picture cameras I have won't do external audio sources.
So, I could video me playing, then record sound straight to my computer, and then mix it all. But, do you really need to "see"? I'm thinking not really. Audio is key, and I want it to be quality, so you get a real sense of the voices.
I could hook it up to an amp, but having done that before with my guitar amp, it sounded like crap, so that wouldn't be worthwhile. Although, now that I think of it, I could hook it up straight to a stereo amplifier and see how that sounds. So many options.... lol