Firstly, welcome to the Alfisti fold,
The petrol boys would be better suited to answer your first question but from post I have read previously it sounds like a worn variator issue.
As a general rule...
The upper wishbones squeak when worn
The lower wishbones knock when worn
The ARB bushes do both when wearing/worn
You can squirt silicon grease into the bushes with a syringe to prolong their life, there is a guide somewhere on here.
For quicker answers, try googling: alfaowner (insert your problem description)
It's much easier than the forum search as a first step and often yields the results you need.
Also, this page and this link is very informative: Alfa Romeo
What is your job and what do you drive if you will excuse my curiosity?