from About Samchillian:

"It's all Relative!"

The Samchillian Tip Tip Tip Cheeepeeeee (patent #5,565,641) is a keyboard MIDI controller ... based on changes of pitch, rather than fixed pitches. This scheme gives the performer the ability to perform extremely quick, rhapsodical lines.

Here's how it works: each key on the keyboard does not denote a fixed pitch, as it would on a normal keyboard, but rather a change of pitch. A user first selects a scale and a key (e.g. F# pentatonic), and then every note played will be in that set of notes.

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