Yamaha Portable Grand DGX-640 Owner's Manual page 51

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Play on the keyboard.
Play to the right of the split point with your right hand, and to the left of the split
point with your left hand.
Play along with the rhythm of the song melody with your right hand. You can
play any keys as long as you're playing to the right of the split point. At the
same time play accompaniment-like chords and phrases with your left hand. No
matter what you play, you'll produce the song melody with your right hand and
beautiful chords and phrases with your left hand.
This is the performance assistant technology Chord/Melody type.
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Press the [P.A.T. ON/OFF] button to turn the performance assis-
tant technology feature off.
"..." will appear on the display where the performance assistant technology type
is normally shown.
Next try playing a different preset song.
Appears when the performance
assistant technology is on
Split point
With this type notes played on the
left-hand side of the split point will
actually sound an octave higher.
The Easy Way to Play Piano
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Marker
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Owner's Manual