The JP-8 is an 8 voice and the JP-6 is a 6 voice . Also the JP-8 has a slightly better modulation section . But ! The JP-6 has MIDI ! You can't go wrong either way , also the JP-8 is not quite as stable in tuning as the JP-6 . Don't let that scare you though , the Japanese synthesizers are NO WHERE near as bad in tuning as the american synths like MOOG , ARP , and OBERHEIM . But , if it's an actual recomendation you are looking for , get the JP-6 , it already has MIDI , and it's cheaper than a JP-8 .