The GMSN! Pure Quantiser takes an analogue CV in and converts it to musical scales. LED buttons control exactly what notes in the scale will play. By selecting all the notes in a minor scale, this is the scale that will play. The level of controls enables the user to play any scale and any mode.
There is a also a trigger out which triggers when ever a new note plays, this could be used to control the volume of each note via an ADSR and VCA. There is also a slew control or portamento which blends notes into each other.
The design is based on the same chip used in the Arduino Uno, which means the same code, libraries and IDE can be used.