Princeton SP-88 - Manual (Page 9)

Voice effect
Voice select
There are 350 VOICES. (See "APPENDIX 1
VOICE LIST") which includes 293 GM Sounds,
35 Chinese Sounds, 13 percussion Sets
and 9 User Sounds.
When the voice feature is activated, the LCD
highlights the "VOICE R1" flag and the selected
sound appears in the upper line. ex: "001
Piano). It displays the style name
"001 8 Beat 1" on a second line. Use the
[+] & the [-] button and numeric keypad to
select the voice you desire.
Note:
The keyboard will automatically check the
validity of your number choice when you use the
numeric keypad to select the voice.
Dual
Press the [DUAL] Button . The LCD lights the
DUAL and VOICE R2, and highlights the Voice
name on upper line "144 Sound Track1".
(See "APPENDIX 1 VOICE LIST")
Use the [+] & the [-] button or the DIAL and
numeric keypad to select the DUAL VOICE.
Press the [DUAL] button again to exit DUAL
mode.
In DUAL mode, press the [VOICE] button to
switch to other voice modes ( VOICE R1/
LOWER)
DU AL
DUAL
DUAL
Note:
When A.B.C and lower Voice is off, the whole
keyboard will be set as VOICE R2.Otherwise,
only the right part will be set as VOICE R2.
The piano will check the validity of number
input when you use the numeric keypad to
select the voice.