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No they dont. Voting anything here will never decrease your Steem Power. But however upvoting will drain your "voting power".

Musing uses a steemit id named musing-threads to keep the answers and quetions here on that account as threads.. The questions here ar comments in those posts. And answers are replies to those comments.

So when you upvote something in musing you are upvoting those comments or replies. And upvoting anything in steemit is upvoting as usual which drains only your voting power. It is in no way whatsoever possible that upvoting will drain your steem power..

Hope this satisfies your query.

Yes, it does , Thank you

Yes it will decrease your steem power because steem power will be increased and decreased based on your up votes as you up vote 100% to any one i guess 2% of steem power having 500 steem power account decreased almost. So i have tried this many times and yes this decrease your steem power.

Because blockchain is connected with each other of steem and musing so for sure it will decrease your steem power by your voting status whether you vote 100%.