"Engineer" isn't an honorific like "Doctor," "Monsignor," or "The Honorable Justice." It's a descriptive noun, like "baker" or "arsonist." There are guilds that qualify people to use their titles, but I do not subscribe to the notion (and I don't believe that the State of Illinois does) that one must be licensed to call himself an audio engineer.
Audio engineering isn't life-or-death like mechanical engineering, electrical engineering or chemical engineering, where the State and professional guilds matter a lot. The consequences of being incompetent are pretty small, relative to some engineering fields. That's why there isn't a rigid standard for who gets to call himself an engineer: Whoever did the engineering work.
I am not legally qualified to call myself an engineer, but I can't think of anything else that would be more accurate.
Do you make a living engineering?
21steve albini
Electrical Audio
sa at electrical dot com
Quicumque quattuor feles possidet insanus est.
Electrical Audio
sa at electrical dot com
Quicumque quattuor feles possidet insanus est.