The Haken Audio Continuum Controller is a three-dimensional midicontroller with integrated sound generation, the EaganMatrix.

With this instrument, polyphonic sliding sounds can be played dynamically by pressure and in vertical position. Internally Continuum has a synthesizer with atmospheric and powerful sounds. The fingerboard simultaneously processes data on the X, Y and Z axes for one to a maximum of 16 fingers. X (left to right) transmits the pitch for each individual note. This parameter can range from light vibrato to dramatic note intervals across the entire playing surface.

The 21s8x Continuum has the same connectivity and sonic capabilities as the larger Continuums but has lower weight and better portability.  Its range can be extended 6 additional octaves using built-in octave buttons.

The 21s8x is 45 x 18.9 x 2.7 cm (17.7 x 7.4 x 1 inches) and weighs 1.6 kg (3.5 lbs).