C-Thru Music Axis 49 Harmonic Table MIDI Keyboard Controller

The top left-most button is unresponsive and is indicated in the pictures with a sticky note. All other keys and functions work like new.

This 49 key harmonic keyboard is class-compliant meaning it will work with any midi device or instrument that accepts USB controllers. Plugins via mac OS, iOS, Windows, hardware synthesizers, eurorack, and more.

This was a very limited release harmonic table controller, making this a more rare keyboard to come across.

Includes standard USB-A to USB-B cable.

How it works:

No music theory is needed. One of the major selling points is the way in which all musical keys feel the same. The fingering and shape of chords and scales are the same in C major, Eb major, F# major, or any other key you like — and you definitely can't say that about a piano keyboard. This freedom in terms of key inevitably makes you think less about the specific notes you're playing and more about the harmonic or melodic relationships within them.

White buttons are naturals, and black buttons are sharps or flats, just like they're equivalents on a piano. However, Ds are shown in light blue and G#s in dark blue, together acting as visual anchors to aid note‑finding and orientation. Now for the pitch layout. Playing up any vertical column produces a series of ascending perfect fifths. Any diagonal climbing from left to right produces ascending major thirds, and right to left diagonals are minor thirds. This means that a standard major chord in root position is formed by pressing down any three adjacent keys in a right‑facing triangle shape. Want a minor chord instead? Just make that a left‑facing triangle.

The two blue arrow buttons along the side increase or decrease the current octave position.