Enhance pitch shifting

[moritzsur]

Sadly the librosa pitch shift is very ... improvable...
Shifted data does not reflect real world data.
Signalsmith stretch is way better.
Im pretty new to python, is it feasible to add a C++ library to a python library?

[iver56]

Hey! Yes, there are definitely better-sounding alternatives out there. Here are a few more:

• https://breakfastquay.com/rubberband/
• https://github.com/KAIST-MACLab/PyTSMod
• https://github.com/vinusankars/ESOLA

is it feasible to add a C++ library to a python library?

Yes, it's possible to make a foreign function interface so we can call a C++ function from Python. But keep in mind that the C++ code would have to be compiled for each target environment, which includes various combinations of operating systems and CPU architectures.

PRs are welcome