"backing track" which stores a sequence of pattern numbers and chord changes. The QY10's sequencer data is maintained by an internal back-up battery, but it may also be stored externally by transferring it to a suitable device, such as a MIDI equipped computer. Tone Generator The QY10's tone generator is a sample-based synthesizer using Yamaha's 12-bit Advanced Wave Memory synthesis technology. The tone generator is eight part multi-timbral (i.e., eight instruments may sound at once) and 28 note polyphonic (i.e., 28 notes may sound at once), which provides adequate support for sequences written on the unit. In other respects, however, the tone generator is quite limited. Only 30 instruments and one drum kit with 26 sounds are available. Furthermore, instruments must be either centered or panned completely left or right. These limitations can be understood in the context of the QY10's primary role as a composition tool, rather than as a musical instrument. Applications Although the primary use of the QY10 is as a portable composing tool, it has other applications. With its pattern-based sequencing system, it is particularly suited for use as an accompaniment device. However, unlike other sequencers in the QY series, the QY10 cannot auto-harmonize its backing tracks to chords played on an external MIDI keyboard. Another application is as a general purpose MIDI sequencer, controlling instruments with far superior sounds than those available from its own tone generator. However, for this use, it has several disadvantages, including fixed MIDI channel assignments and limited support for MIDI control information. The pattern-based design of its sequencer might also be considered a disadvantage in this context. Legacy The QY10's legacy is the introduction of the walkstation and the QY sequencer. It has also influenced the physical design of many of Yamaha's subsequent devices, for example the MU5 sound module, the RY8 drum machine and the SU10 sampler. The CS1x, CS2x and AN1x have a small lip on the right hand end of the keyboard to accommodate a QY or SU sized module. References External links Yamaha manual library How to add GM support to the QY10 from Sound on Sound Magazine at archive.org QY10 sequencing clinic from Sound on Sound magazine at archive.org Burnkit2600's guide to circuit bending the QY10. How to replace your internal battery. Polynominal QY10 resource: manual, tips, MP3 demos and review. QY10 Music workstations