PeteSasqwax Made a “just a quick” YouTube Tutorial showing how to configure a Koala into Koala resampler using:

AUM
Nembrini Tuner (for tuning the samples pitch)
RRS PolyIvoks Filter (worth getting but any FX will do)

Building it yourself from the video will teach you about sidechaining in AUM (using the power of multi-out apps like Koala).