wheel range, steering lock, ffb multipller?

Can some one help me on understanding the following please. , i am trying to work out what adjustments the following ajustments do ,

1) If i had a wheel range of 400 and i take it up to 700 does this mean i get more turn in with the wheel i am using?

2) if i had steering lock of 20 and i went to 12 what is this actually doing to my set up?

3) FFB Mutipller does this increase the overall ffb form the ffb menu settings?

Thanks