#1
Whats the deal with PAs? I mean, whats the point of them? Is it to amplify/equalize your instruments?
#2
^Yup, they're used at gigs etc so you can mic all the amps/vocals etc and actually have a decent, together sound and will project well.
"Breathe, breathe in the air
Don't be afraid to care"

Fender Strat/Tokai LS80>few pedals>Orange Rocker 30
#3
...or your singers vocals. Can be used to equalize all the instuments, though if they're miced properly.
#5
No no, it's basically just something to amplify everything with.
Such as you can amplify vocals, and mic up amps and drums and amplify them thru the PA.
"Breathe, breathe in the air
Don't be afraid to care"

Fender Strat/Tokai LS80>few pedals>Orange Rocker 30
#6
PA is Public Announcement.

For gigging, it means that the venue has speakers set up and installed in the hall, rather than a series of speakers on the stage having to fill the room.
#7
Yep, vocalists could really use "audio manipullating" tools nowadays.......
Tone is all ...... well probably 75%, in your fingers.
The rest depends on your wallet's thickness !!

Keep the faith, baby!!