poly~ vs and rate

i have not needed it before and it is not mentioned in the helpfile:

1.
how do i reset a poly patcher to the original vs and rate?

2.
and do i understand that right, that when you do rate *2 that poly automatically
does vs *2 - but only when possible?
this seems a bit strange, because there is no way how to check if the automatic
change could sucessfully be performed or not.

-110