if someone is using an arranger, then, they are certainly using midi files..that is, as people would know, is how the arranger files are recorded...as a whole lot of repeating small midi files....so what's the difference playing arranger "midi files", playing them using left hand for chords/ bass and right hand for comping/soloing...OR a set midi file with drums and other fill instruments playing, whilst you play bass/chords with your left hand and comping/ soloing with right hand???? NONE NADA NIX NYET, apart from the fact arranger midi files repeat continuously, whereas the midi file has a fixed length....so on that basis and according to some arguments put forward on this thread,both methods are cheating..... .....personally i do not believe its cheating..the only way there is no cheating is if you have a guitar player, bass player, drummer, singer.....you get the picture