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Thanks for your efforts to look into/explain.

Even with such functionality, it seems complicated and limited, esp compared to a traditional TV remote. Why the heck can't Apple just put a vertical virtual slider up/down the whole side? (Sometimes it is necessary to quickly adjust volume on the fly, as well as hit a mute button; not having this done easy is very incomplete.)

Oh I agree. I was actually puzzled it was so buried when I first found it. ^_^
 
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