DISTRHO https://github.com/DISTRHO/DPF-Max-Gen
1 Pedalboard using it

MaPitchshift

Plugin screenshot
Spectral Pitch Shifter

Max Gen Pitchshifter example.

Control Default Min Max
blur 0.00 0.00 0.25
window 100.00 0.10 1000.00
ratio 1.00 0.25 4.00
xfade 1.00 0.00 1.00
http://distrho.sf.net/plugins/MaPitchshift v.0:0.1-13