That sounds funny. Anyway I bought a book of Bach duets for trumpet, and I'm really excited about the thought of recording duets with myself. We have a very nice digital recorder that will do up to 8 tracks (we record a weekly podcast with it).
So do you just record the first track, and listen to it in headphones while recording the second track? Or do you listen to a click-track / metronome while you record each track separately?
Also, the recorder has unidirectional mics on it. We don't usually use those. We have a Crowne floor mic that might be better for this (we use it for ambient noise during the podcast). We've also got a set of binaural mics that we could mount in a stand, for purposes of recording. What do you think?