Making beats on a circuit board that looks like a calculator

Rows of buttons sit beneath a small screen that looks ready for numbers. Tapping them produces rhythm rather than a calculation. The pocket operator from teenage engineering is a palm-sized electronic instrument with an exposed circuit board. On a desk, it looks almost as much like a component as an instrument.

The similar appearance does not mean every model sounds the same. The range assigns different roles to drums, bass, and melody. PO-33 K.O! is a small sampler with a built-in microphone. The manufacturer specifies 40 seconds of recording memory, enough to select short fragments of surrounding sound as musical material.

Sequencing and repeating a rhythm are central to the device. Sounds are assigned positions in a pattern, which keeps playing when the hands are lifted. The starting point differs from performing a long keyboard melody: choose a brief sound, then decide where it falls within a repeating sequence.

Leaving out a rigid outer case is part of the construction approach. The manufacturer says key components are placed beneath the display, allowing the instrument to work without a separate enclosure. The visible board is its real structure rather than a decorative pattern. A separate silicone case can be fitted if desired.

Multiple units can be connected by cable to synchronize their timing. One can supply drums while another adds a different sound, with the devices staying in step. This does not imply automatic compatibility with every piece of music equipment or eliminate the need for setup.

The limited recording time also shapes the work. Instead of accumulating long files, attention goes to a fragment and its repetition. A short recording becomes a sound assigned to a button, ready to be brought back into a rhythm.