Hey Team!
We’ve worked on a fix for this: click-to-play, as you suggested.
We haven’t deployed it yet, but it would be how all oEmbed embedded Pens would behave.
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When the embed loads, you get a (very lightweight) placeholder with the title of the Pen and author and such. Plus a big “Run Pen” button.
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If anywhere on there is clicked/tapped, it loads the embed.
Thus, no unexpected sound, no unexpected crazy CPU use, no going to a page with a zillion embeds and feeling the lag, etc.
That work for you?