I remember hearing a fantastic acoustic guitar player on NPR, and the host commented on how there weren't any squeeks from his strings. The player humbly replied that with the best playing techniques, there aren't squeeks.
MEAnwhile, out here in the Real World--!
James said:
"...I've heard that some people actually ADD IN string squeaks to give them a more 'authentic' sound...........bizarre."
You bet. Us keyboard players do that all the time. In fact, "fret noise" is a Standard Midi sound! Judicious use of a good fret noise sample really helps authenticate a keyboard guitar part.
rbowser