Keyboard Sounds

hmmm...
does the sound we make typing on the keyboard differ from letter to letter? Or at least for typewriters is that the case? Because my spacebar makes a different sound from my caps-lock. Maybe even for phone pads.

WOAHH

i'm gonna research this and get an ignobel for it. YAH GOH IGNOBELL GOH GOH!!!!

The different size of the keys probably has something to do with it. When different size keys are struck, they make different sounds.

Also, POSTING FROM A MODEL M.