Roland VP-550 Owner's Manual

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Raising Vocal Designer’s pitch by one octave 
( 8va)
Here’s how to raise Vocal Designer’s pitch by one octave.
Press the [8va] button; it will light, and the pitch of Vocal Designer 
will rise one octave.
Press the button once again; it will go dark, and Vocal Designer will
return to its original pitch.
“8va” is a symbol meaning “play one octave higher.”
Unlike the OCTAVE [DOWN]/[UP] buttons, the [8va] button applies only to the Vocal Designer part.
Use this when you want to raise the Vocal Designer part one octave higher than the ensemble 
part.
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