The Pitch CV Modifier module is a CV transpose module (NOT AN AUDIO SIGNAL MODULE) which can transpose 1V/OCT inputs in octaves, semitones and quartertones.
Taking inspiration from some physical Eurorack modules, this module allows inversion of the signal and switching of the inversion and transposition on and off.
The inversion point can be controlled (useful for inverting envelopes around the sustain level) with a Learn button to set the level to the current input. To make setting the inversion point as easy as possible, the value can also be set to specific notes using the notation A#4, C-1, Gb+3, etc. in addition to entering as a normal voltage value.
Using gates to switch these modes can generate interesting harmonic variations. Using a number of these with voltage-controlled switches or sequential switches can generate interesting harmonic movement.