Gesture guideYour left hand selects the chord and root using a fist, one to four raised fingers, pointer + pinky for Bβ, or an index-thumb pinch. Touch a right fingertip to the thumb for bass, move it away for chord, or hover midway for both. Height controls volume, moving right darkens the tone. Slow movement stays smooth; fast sweeps transform each sound. Tilt shapes the extensions.