- Transforming smooth or random modulations into pitch sequences.
- Transposition and key modulation
- Make it easier to play certain types of music (esp. chromatic) on continuous controllers (theremin, pressure strips, etc.)
In general, quantizers take a continuous (i.e. smooth or random) input and output a discrete (i.e. stepped) version. The Scale Quantizer uses the intervals of musical scales (translated to the 1V/octave standard) to determine the set of values that can be output.