I think, given that it's comics canon, the sound can be whatever you want it to be.
Personally, I think it would be hilarious if it made tinkly musical sounds like a steel drum, so that Steve would always be doing battle with a funky Caribbean-flavored soundtrack.
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Personally, I think it would be hilarious if it made tinkly musical sounds like a steel drum, so that Steve would always be doing battle with a funky Caribbean-flavored soundtrack.