High Quality Content by WIKIPEDIA articles! The Yamaha QY10 is a hand-held music workstation produced by the Yamaha Corporation in the early 1990s. POssessing a MIDI sequencer, a tone generator and a tiny single-octave keyboard, the portable and battery-powered QY10 enables a musician to compose music while traveling. THe main feature of the QY10 is its eight track sequencer. WIth its "pattern"-based design, it was more suited to supporting song writing rather than creating full musical compositions. A Pattern is a short sequence of backing music played on bass guitar, percussion and two other instruments. PAtterns for various musical styles are built into the QY10, for example European house music, rhythm and blues and bossa nova. USers may also write their own patterns, which must be written in the key of C major. WHen playing a song, the QY10 automatically rescales patterns to match a selected chord.