Roland RG-3 - Manual (Page 73)

71
Chapter 3. Performance
5.
Press the [Function] (Exit) button so the indicator goes out.
Octave
When you play a key while pressing on the pedal, the note for
the key being pressed and the note one octave above it are lay-
ered and played together.
You can adjust the volume of the sound one octave above the
layer tone by changing the pressure used on the pedal.
Value Description