This is the classic example of what happens when a player grows up using a tuner instead of tuning by ear.
learn to tune by ear and you will not be able to stand and wont miss out of tune tracks.
as an engineer we want the record to be the best it can be, but it is the job of the player to tune his instrument
| Blast9 .What would you do if you were me ?
If its just a demo i wouldn't worry to much, you can ask them if they want to spend more $$ to re track
what does it sound like with the bass
what do the vocals sound like ?
is it worth putting the extra $ $$$ into fixing the guitars if all the vocals do is scream and do grunting cookie monster sounds
Its all about the feel ! Remember its rock n roll .... let it rock !
As far as sharing guitars and amps thats a no no ....
You can get a way better sound with 2 separate rigs.
you should always check tuning before every song or overdubs
(and have everyone use the same tuner)
It really boils down to does the band want to spend the $$ to re track.