Medeli mc80 standard Instruction Manual page 9

The number buttons:
The number buttons can be used to directly enter the number of the desired voice, thereby
immediately selecting that voice without having to step through a number of other voices.
Two-digit voice number are selected simply by entering the two digits in sequence--e.g. to
select voice number 17, briefly press the
Three digit voice number are entered by first pressing the
remaining two digits in sequence.
Dual voice:
To create a dual voice effect, use the number buttons to input the first voice digits. Pressing the
[DUAL] button, a word
digits. Press the [DUAL]
display.
Instant select Piano voice:
You can select the piano voices immediately by pressing the
button again to return to the previously selected voice.
[1] button and then the
VOICE 2 appears in the display. Then input the selected second voice
button again to turn this function off, and a word
[7] button.
[+100]
[PIANO]
8
button, then press the
VOICE 1 appears in the
button. Press the [PIANO]