yamaha qy70 or da qy 100..... they been out for years now, but it's a good piece for cats on da go... like I do security, and sometimes I'm at a post where I can bring a dvd player or something like that... so I figured I would cop that, and work on shit while I'm at work then dump it into my cpu when I get to da crib.... my guy had his 70 since like 1995 and it's a highly capable tool.. it ain't that big at all, it's smaller than a cpu keyboard, but you can sequence and edit while you're on da go.(battery operated as well).bus, train ride, etc.... plenty of patterns(128), etc etc......highly sophisticated instrument from yamaha... check it out
a link for the qy 70
QY70
and for the 100
QY100