I have a Pedulla fretted with the EZQ system and Barts installed as OEM, and it sounds somehwat like the range of tones but not 100% like my Alembics.
That being said, when I located two or three NOS ESQ UNITS, I bought them and installed one unit into a Pedulla Buzz that I had refinished and restored by Mike Pedulla himself. He would not install the ESQ, I had to have Rudy's Music in NYC wire up the EZQ. I like the unit and agree that they are noisy, but keep in mind, this unit was designed back in the late 70's /early 80's. When I look for used Pedullas from th Mid 80's I seek the ones with the EZQ already installed.
I wish Bill Bartolini would update the design, then I would install one EZQ system on each pickup of the Fretless Pedulla I refurbished.
Finally, I also was under the impression that they were discontinued. I do think EMG makes a somewhat similar unit.