Ive been interested in one of these for a while and just thought itd be fun to mess around with. So ya does anyone make one--sorta like this http://cgi.ebay.com/Rheem-BASS-KEYB...347498907QQcategoryZ29552QQrdZ1QQcmdZViewItem
Yes, check out a Novation Bass Station, Roland SH-101 and a few other synths. Fender also made a bass version of their Rhodes electric piano.