the siding can be rubbing against the styrofoam causing noise. vinyl siding is supposed to be nailed on with large head roofing nails. they are not to be nailed tight. siding installed is hooked into bottom piece and then lightly tugged up and nailed.
..the sound channels? or are they just an air space to keep the wall ventilated.
you could put tar paper or a house wrap in between the styrofoam and the siding to stop movement squeeks. (i know ,alot of work).
i live in a very windy area and my siding never rattles. i have no styrofoam on the outside, just tar paper on the wall and then the siding. i only got siding crackling noise from the fact that the siding was attached using air staples. so when the hot summer sun popped out from behind a cloud, the siding would expand and crackle on the south side. it's a bother but it was on before i bought the place.(my addition eliminated this wall and the new south side was attached using roofing nails.(no more noise))
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