Yamaha PSR-540 - Manual (Page 122)

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Pitch Bend Range
This determines the maximum pitch bend range for the PITCH BEND wheel.
The range is from “0” to “12”. Each increment corresponds to one semitone.
• Set the Pitch Bend Range with the data dial, the [+/YES] button, the [-/NO]
button or the number buttons [1]-[0].
Other Functions (Utility)
Bend Range = 4