Just noticed today Stefano has released Version 5 of DSP Quattro:
http://www.dsp-quattro.com/dspquattr...P-Quattro.html
Upgrade price from V4 is $39 US and full price is $79US. Not too bad there.
Was ready to jump on it but it requires El Crapitan or higher which leaves those of us on Yosemite or lower out of luck. I wonder if it's locked out of earlier OSX versions like the latest revision of Kontakt 5 requires higher than Yosemite? I'm staying on PT11.3.2 which maxes out at OSX 10.10.5.
As an aside I have a test partition on an external drive that has Sierra on it (don't remember the exact build) and PT11.3.2 seems to work okay the small amount of time I put in on it.