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The Continuum is a music performance controller developed by Lippold Haken and sold by Haken Audio, located in Champaign, Illinois.[1]

Technically a MIDI controller, the Continuum features a touch-sensitive neoprene playing surface measuring approximately 19 cm high by either 137 cm long (full-size instrument) or 72 cm long (half-size instrument). Sensors under the playing surface respond to finger position and pressure in three dimensions and provide pitch resolution of one cent (one one-hundredth of a semitone) along the length of the scale (the X dimension), allowing essentially continuous pitch control for portamento effects and notes that aren't on the chromatic scale, apply vibratos or pitch bends to a note. While pitch bend and vibrato are standard features on most MIDI keyboards, sliding between half steps, as permitted by the Continuum, is not. A software "rounding" feature enables pitch to be quantized to the notes of a traditional equal-tempered scale, just scale or other scale to facilitate in-tune performance, with the amount and duration of the "rounding" controllable in real time.

The Continuum also provides two additional parameters for the sound: It is also able to transmit the finger pressure on the board as a MIDI value, as well as the finger's vertical position on the key. These parameters can be used to enrich the sound even more, for example to modulate between two sound banks. The Continuum is capable of polyphonic performance, with up to 16 simultaneous voices.

The Continuum does not itself generate sounds. Rather, it must be connected to a sound-producing source that will receive MIDI input, such as a synthesizer module.

Perhaps the most famous player of the Continuum in contemporary music is Dream Theater's keyboardist Jordan Rudess. It can be heard in the songs "Octavarium" from the album with the same name, and in the end of the song "The Dark Eternal Night" from 2007's Systematic Chaos. He is also seen playing the Continuum on Dream Theater's 2006 live DVD Score. (To see it, click here)

The continuum is also played by Jordan Rudess on John-Luke Addison's Multiple Valences album in the song "Unimaginable Charimatics".

• Jordan Rudess (Dream Theater)
• A. R. Rahman^{[citation needed]}
• Arshaan Bath^{[citation needed]}
• Peter Chau^{[citation needed]}
• Kevin Stobbe^{[citation needed]}

• Haken Audio
• Review of full sized Haken Continuum
• Youtube videos featuring Continuum with V-synth XT