i know this is a late reply but still, one of my friends did a recording of his band with his mp3 playa and it turned out pretty well. some recorders record certain pitches of sound more, as in some recorders will respond to bass more (bad if you wanna hear the vocalist) some will respond to treble more (bad if you wanna hear the drummer) and some work really well and respond to everything well. i guess work with what you got and compensate, ie turn the vocals louder if it's a bssy recorder, or turn the vocals down if it's a trebly recorder.