Resistors

And some circuits require ruthless parts selection, tolerancing, tuning in the anechoic chamber and a test listen.

i know somebody that has been doing that since 1977. I met him in 1983. My religion since.

What this proves:
1. Auditory memory is a lot longer than some people think; and
2. Parts quality makes a lot more difference than some would have you believe.

you forgot 

3. it could be imaginary. 

Mmmm, treat yourself to a warm cocoa for saving the world from whatever it is you imagine you're saving the world from. <golf clap>

Some trolls remind me of really poor, Carbon-comp resistors.

The same linage of Troll said Stradivarius should have used Ace Hardware paint.....