1

I heard an old Barnstorm album where Joe Walsh made his guitar talk. How did he do that?

3

It's actually unbelievably simple.

The guitar signal feeds to an on-stage box, which contains a small speaker. A hollow plastic tube comes from that box up to the performer's mouth.
The performer puts the end of the tube in his mouth & can shape the signal straight into his vocal mic.

Not the answer you're looking for? Browse other questions tagged or ask your own question.