HP Princeton HP-21 - Manual (Page 12)

1. Power Switch & Volume
1. Turn the POWER switch on.
The LED display lights up.
2. Use the volume control switch to adjust the
volume to your desired level
Caution:
If the LED display has not lit up after you turned on the piano, please check the power supply.
If the piano is silent, the volume may be adjusted to its minimum level.
Although the Main switch may be in the OFF position, the piano is not disconnected from the power
supply completely!
2. Voice/Dual Voice
Select a voice by pressing one of the [VOICE
TYPE] button, the corresponding indicator
will light up and the number of the selected
voice will appear on the LED.
Press the [DUAL] button to enter the Dual
Voice mode, then select the second voice by
pressing a [VOICE TYPE] button.
To exit the Dual Voice mode, press the
[DUAL] button again.
While recording, Voice 2 will turn off
automatically.
3. Metronome
Press the [METRONOME] button to turn
on/off the metronome function.
You cannot use the metronome function when
the DEMO song is playing.
To turn off the metronome, press the [STOP]
button.
4. DSP (Digital Signal Processor)