Hello, how do you set proper intonation on your guitar? couple things i don't get . Some guitarist place their bridge like on a angle ? why is that ( i understand this with those old ones that you dont have adjustable bridge saddles ) angle means more friction no? Secondly if you set your intonation you should harmonic at the 12th fret but i found this to be always right nomatter how offset your bridge is . when i like fret the 12 fret its a halftone off. So should i fret the 12 th fret and then set it to pitch ? Please tell me once and for all how to do it .