Heptatonic Harmoniser

UPDATE Added mono Gate In and polyphonic Gate Out jacks with a switch to control how many of the harmony voices will generate gate signals. This allows global polyphony settings greater than 5 without oscillators generating unwanted drone notes from those poly-pitch inputs that have the system default value of 0V.

The He-Ha (Heptatonic Harmoniser) takes a monophonic input (Pitch CV) and outputs a chord of up to five notes through individual Mono CV outputs and a single polyphonic CV output. Along the way:

• The incoming pitch is quantised to the chosen key and heptatonic scale, the same thirty-six distinct scales available on the Aleatoric Interval Sequencer.
• The chord is formed by stacking four intervals (anywhere between ±20th.
• The intervals used are individually under user control.
• The chosen intervals can also be individually modulated with external control voltages.
• The chord can change with every new note, after a certain number (fixed or random) of new notes have arrived or after a given number of externally sourced trigger pulses.

Demo video available.