We (us Woodchucks) find that, if two of you are both playing guitars, the overall sound is often greatly improved by one or both using capos to play in the same key using different chord formations. I. e., if the song is in C, one of us might play the usual C chords and the other capo up 5 frets and use G positions. Makes it sound much more like two different instruments and less chaotic. Or so it seems to us.

Peter.