Yamaha RY9 Owner's Manual page 11

The RY9's many other features include song chaining and loop repeating,
rhythm "swing" function for a realistic human feeling, guitar tuner and guitar
synthesizer, 28-note polyphony, stereo outputs, headphone jack, and a large
LCD screen which always lets you know what mode and status you're currently
in. Hence, the RY9 is the ideal music tool that's useful in practically any music
situation. You can use it as:
A Practicing Companion
Plug a guitar directly into the RY9 and play along with the patterns and songs.
Mute one or more of the accompaniment tracks, or turn the backing off
entirely and play along with the rhythm only. The RY9 provides just the music
you need for a hot practice session.
A Music Sketch Pad
String together a series of Preset and User rhythm patterns, designate a
backing accompaniment, and specify the chord progressions for a song idea.
Creating your own songs is quick and easy with the RY9's user-friendly
interface.
A Powerful Drum Machine
Program professional sounding rhythm patterns by Step or Realtime recording,
complete with accent dynamics and "swing" factor for a realistic human feel.
Whether you modify a preset or create your own rhythm pattern from scratch,
the RY9's auto-quantizing makes sure your rhythms are always on the beat.
A Guitar Synthesizer
Plug a guitar directly into the RY9 and "trigger" AWM normal voices (including
acoustic piano, strings, brass, synth pad sounds and more) in real-time with
the notes you play on the guitar. You can specify the RY9 to "synthesize" any
of the 50 normal voices as single notes, octaves, harmonies and more—in
order to create interesting and unique sound textures.
A MIDI Tone Generator
Connect an external MIDI keyboard or sequencer in order to play the RY9's
AWM drum voices. You can specify the note table by which the different voices
will be sounded.
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