Theremin MIDI Controller Kit

Altura MkII+

Play MIDI in mid-air. A pair of ultrasonic rangefinders replace the theremin's antennas, driving any General MIDI device, with a built-in arpeggiator and scale quantizing.

Main board PC-73-01
Output MIDI DIN
Skill Intermediate

Open the interactive assembly guide Buy this kit

Build the kit

The interactive guide walks the build step by step against a zoomable board image, and remembers your progress in this browser.

Interactive assembly guide Web app

Every step with the exact parts highlighted on the board, resistor color bands, part photos, a searchable component index, and saved progress.

Main board PC-73-01 Assembly manual PDF

The complete printable assembly manual, the same document included with the kit.

PDF · 4.1 MB

Play it

Get sound out of the instrument first, then dig into the full feature set.

Quick start & reference manual PDF

Quick start gets you playing fast. The reference section documents every function, key and scale selection, octave ranges, and the arpeggiator.

PDF · 1.5 MB

Earlier revisions

For the previous-generation Altura MkII. If your kit is an MkII+, use the documents above instead.

Altura MkII assembly manual PDF

Assembly manual for the prior-generation Altura MkII, including the cabinet build.

PDF · 9.6 MB · Legacy

Help and community

The forum is the fastest way to get unstuck. Most build questions have already been asked and answered there.