I've had a little search but can't come up with much from the forum.
I have a few different granular polys~ which all work using a pitch ratio (0.5 = -12 semitones, 2 = +12). I want to be able to change these pitches with a global control, which also works on ratios. After a bit of rudimentary fuddling I had something which sounded correct by adding the global pitch ratio to the current pitches, but this doesn't work when the main pitches are in a high ratio, as the global pitch is limited in my patch to -1.
Here's a patch to demonstrate the problem: