The english language is a mess... thus, trying to find the "correct" way of saying many words often turns into a case of toe-may-toe/toe-ma-toe. I tend not to bother anymore. However...
Having seen and used this word in physics and engineering, I heard it pronounced "pie-zo". Never heard it said any other way until it was spoken by a musician.
So, say it the way you want, but I say "pie-zo", as it said by those who work with and understand the phenomenon in the engineering world.
The "Pie-zo" pronunciation also seems to follow basic english language rules the closest.
It also fits closest with how one would say and spell it phonetically.
All the other ways of saying it seem to break one or more of these criteria.
Hence, I say "pie-zo". I don't care how the rest of the music community says it
X.
