I always understood that Zappa formed his Discrete record label with the intention of doing quad mixes exclusively for his new recordings. And, of course, WB's CD-4 LP quad system WAS 4 discrete channels, hence, I guess, the label name.
I gotta say I admired Frank more than I liked him. His intelligence and fearless independence were inspiring, as well as his 24/7 work ethic & ceaseless output. Zappa, like John Mayall in the UK, served as a boot camp/grad school for hordes of talented musical up & comers who were willing to temporarily subordinate themselves in Frank's band & touring. I was able to see them live in Iowa City circa 1977, and I'm glad I can say that I saw him.
Even so, I found him coarse & abrasive, so overheated with the need to blaze his own trail that he smoked out some listeners like me. His lyrical conceits were frequently juvenile in a way I wasn't willing to get on board with, and while I was dazzled by his musical literacy & willingness to pull off some extraordinary instrumental wizardry, it honestly got tiresome for me. I likewise couldn't get on his wavelength for '50's doo-wop and avant-garde orchestral music. HOWEVER, as always, no one's "WRONG" to like him, I just frequently find him to be a WAY too spicy of a dish most of the time. Brand new surround reissues are always welcome, though, but I'll pass, thanks!