Here's another clip showcasing the new Haken Audio Slim Continuum 21s8x.

The Continuum, powered by its EaganMatrix, produces an incredible sound and offers high levels of expressivity.

One of the instruments most notable features is its intonation modes, known as Rounding. When Rounding is disabled, glissandi and microtonal pieces can be played in the same way as on a violin or cello. However, if you want to play in tune without rounding, it is important to practise.

The Rounding feature is explained in the manual in the following way:

Ideally, the Continuum Fingerboard is played without the idea of a predetermined scale. A skilled violinist is not constrained to pitches from a particular scale during a performance; instead, the violinist micro-adjusts the pitch of each note for optimal harmonic musical results. Similarly, a skilled Continuum player is constantly listening and adjusting finger position to obtain the desired results, and does not rely on the Round Rate mechanism to make up for inability to place fingers properly. For beginners, the Continuum’s Rounding feature seems to be helpful, but the short-term convenience will eventually have long-term consequences. Important finger placement, muscle memory, and listening skills will be compromised. A Continuum player that requires Round Rate is a bit like a singer that requires auto-tune to sing in tune. The exception would be in playing a preset that has a pitch centre that is indeterminate, like an ensemble of strings or voices.