ChaptersCalculator

Calculator and memory

The calculator

Flip POWER to CAL and PocketTone does sums. Every digit you type is a note, and = plays them back.

Verified for version 1.1.0 · Updated October 17, 2026

The pocket-toy party trick. Slide POWER to CAL: the LCD becomes a calculator display, CAL appears beside the voice name, and the instrument switches to a calculator's buzzy beep.

PocketTone in calculator mode: 1989 on the LCD, PIANO CAL beside it, and POWER on CAL.
POWER on CAL. The function keys now follow their red legends.

Play a sum

  1. Type a number on the white keys marked 0 to 9. Each digit sounds a note as you press it: 0 is middle C and each digit is a semitone higher, whatever OCTAVE says.

  2. Press an operator: ÷ × − +. It adds a short rest to your tune.

  3. Type the next number, and so on.

  4. Press =. The answer appears, and everything you typed plays back once as a melody, rests and all, at the current tempo.

How it counts

It works like a real pocket calculator: eight digits, one memory, and each operation runs as you go, with no order of operations, so 2 + 3 × 4 = gives 20. Dividing by zero, or an answer of nine digits or more, shows ERR; press AC to start again.

KeyIn CAL
ACClears the sum and the notes you typed, and stops playback. The memory stays; MC clears it.
CClears the number on the display. The notes you typed stay.
MCClears the memory.
MRShows the memory.
M+Adds the display to the memory. With TONE on ADSR it also stores the voice's code: see The ADSR voice.

A tune holds up to 100 notes. Only a press counts: sliding along the keys does not type, and only the keys with digits make a sound. Flipping POWER back to ON stops the playback, clears the typed tune and brings your voice back.

Still stuck? Write to zhi@nonoaudio.com. Support page