pitchshifting delays with gen~

I'm looking for a reasonably fast and smooth sounding pitchshifting solution in gen~ (or RNBO for that matter). I did an implementation using the approach Sam shared in this old max tutorial but I'm getting more clicks than just the one at the phasor turnaround - and for some reason the ducking approach he used isn't working in gen. My gen patch is attached- but if there are some fundamental problems with this approach in gen, or if anyone has a recommendation for a different algorithm I'm happy to change approaches. My end goal for this is a realtime application so I am latency conscious, but am down to work with whatever is actually possible. Thanks!