You play BrushStrokes simply by drawing. Gesture, sound and visuals are all very tightly linked.
Sound is generated in a manner similar to scanned synthesis, with two oscillators whose waveforms are obtained by scanning the x- and y-axis positions of the trail drawn by the user. The larger the gesture, the louder the sound, and vice-versa, when the mouse is not moving, no sound is generated.
- MIDI notes change pitch of the audio
- Mouse click freezes the motion of the brush (freezes the waveforms for the two oscillators)
- Automation for the position of the brush, and whether it’s frozen
- Automation is by way of recording your mouse movements
The ndc Plugs website shows a processing applet which demonstrates a slightly cut-down version of the visual part of the instrument.