ok i know it's an old post, but i have very similar little bit annoying
problem when starting a cold engine. But in my case when i put contact and turn engine on immediatly produce that annoying sound when engine is already started. It's very hard to describe how it hear like, but on my knowledge it's a little bit reminiscent of the sound when you start engine that's allready running.
It's possible that
problem lyes in starter? I doubt it on a belts, because a few days ago i had a mayor service on engine