Ever played an original FuzzFace from around 1970? (HINT: Not AT ALL the same sound as ones with the same namesake being mass-produced currently.) Ours has two intentionally mismatched (for harmonic content) silicon transistors that snarl and spit… not for the meek! If you put the “Fuzz” on 10 you will rip, and you might get all sorts of oscillation and weirdness… but that’s Rock. Don’t try using it with a wah wah… you can’t, and neither could Jimi, without it screaming and howling. You want polite and quiet? Go elsewhere. You want art in a box? Come on in.
Michael Fuller (founder of Fulltone) got his hands on Eric Johnson’s Blue Fuzzface that he used from Tones through Ah Via Musicom period (now owned by Ian Moore) and incorporated a few of its tonal secrets into the ’70 pedal with staggering sonic results!