the most companies doesn't sell an arranger without keys. :-(
Well, the discover is available without keys, but 1st it's a MIDI file player keyboard and 2nd, they did this for Karaoke or for singers.
There are some discussions about G 70 here http://www.synthzone.com/ubbs/Forum37/HTML/008827.html
much time before Roland released infos and in German there http://www.yamaha-europe.com/UBB_threads...=5&o=&fpart=all
Maybe the release of the new Roland G 70 may reactivate this forum.