Adding dither to your track

[ritaheed]

Who adds dither to there tracks? does it make a huge difference with discising the digital distortion? a take it this is done at the mastering stage?

What im not to sure about with dither is the adding of different noise shapes (rectangle, gaussian and triangle)... if i was to add white noise then that is simply adding a rectangle noise shape?

also can someone explain the signal to noise ratio in relation with the noise shapes - not sure what that means

cheers in advance :)