SHIFTR is a spectral pitch-shifter. It finds the partials in its input and moves each one to its new pitch, up or down by as much as two octaves, without changing the input's speed. PITCH can also be played at 1 V/octave.

It can hold a voice's formants in place while the pitch moves, or move them on their own. It also has feedback, in which each pass is shifted again, and a spectral freeze.

For more info, read the fine manual.