> Mostly, it is used in oscillators to produce sine waves. Well technically to get sine you need a gain of exactly 1, anything above that will increase distort

> Mostly, it is used in oscillators to produce sine waves. Well technically to get sine you need a gain of exactly 1, anything above that will increase distortion. Now to get it to start oscillate in the first place you need above 1 so old school low distortion sine generators usually have some kind of automatic gain control