Volume; Octave - Yamaha PortaTone PSR-1700 Owner's Manual

Selecting & Playing the Voices
You can individually set the volume of each orchestration part to set up the ideal balance between parts.
Z
X
C
You can individually shift the octave of each orchestration part up or down by up to two octaves. This makes
it easy, for example, to lower the pitch of a bass voice to an appropriate octave without affecting the other parts
in your orchestration.
Z
X
C
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Use the ORCHESTRATION [EDIT] button to select the part you want
to edit.
Press the VOICE control section [VOL] button. The current volume
value of the selected part will appear on the LCD display panel.
Use the [+] and [–] buttons, the number buttons, the data dial, or the
[VOL] button itself to set the desired volume. The volume range is from 00
(no sound) to 24 (maximum volume). The default volume value (21) can be
recalled instantly by pressing both the [+] and [–] buttons at the same time.
Use the ORCHESTRATION [EDIT] button to select the part you want
to edit.
Press the VOICE control section [OCTAVE] button. The current octave
value of the selected part will appear on the LCD display panel.
Use the [+] and [–] buttons, the number buttons, the data dial, or the
[OCTAVE] button itself to set the desired octave. The octave range is from
–2 (down two octaves) to +2 (up two octaves). The normal octave value for
the selected voice can be recalled instantly by pressing both the [+] and [–]
buttons at the same time.