To assist in learning to play the instrument, the Theremini features a built-in tuner that allows you to see what note you are playing and whether the note is sharp, flat, or in tune. A 0 to 100% assistive pitch correction knob allows you to adjust the playing difficulty level of the device by automatically keeping the sound in pitch to a user-defined scale or root note. At 100%, the assistive pitch correction will make it impossible to play a wrong note. At 0%, no pitch correction will be applied. The tuner and assistive pitch correction functions can be used in conjunction to educate the performer on the range of the instrument and develop proper playing technique.

Additional controls include a preset knob that provides 32 wavetable-based sounds, root and scale buttons for selecting a scale and root note, controls for setting and recalling a playing range, and a variable stereo ping-pong delay for individual presets.

For listening, the unit includes a front-panel 1/8" stereo headphone jack with a volume control, as well as a built-in speaker that is muted when the headphone jack is engaged. Two 1/4" audio outputs enable connection to an audio interface, mixer, or other equipment for studio recording or live performance. A single-pitch CV output with selectable range enables external connection to a sequencer or synthesizer using a control voltage signal, and a mini-USB port allows the device to communicate with other devices over MIDI.

The unit's pitch antenna can be removed and placed in a built-in storage compartment on the bottom of the device. Integrated rubberized feet prevent the unit from slipping on the playing surface, and a built-in 3/8" microphone stand connector allows you to put the instrument on a stand. Alternatively, you can use the included camera stand adaptor for placing the unit on a tripod. An amplifier, case, and stand are available and sold separately.