2) Normal M2 behaviour
3) The amp thump is timing based, so if it takes your system longer to initialize audio drivers than the M2 is set for, then it will thump. Shutting down there is no such feature, so it will happen if only using the M2. <shameless plug>Using something like the FB you can have it control your amp and it wont do anything until after windows loads.</shameless plug>
4) Again because your amps are on and the audio drivers are not yet initialized. So tiny noises are being amplified. Only fix is to not turn on the amp until the drivers are loaded.