Why can't I use my buds as 2-channel now, when I've always used them as 2-channel? I use Razer wireless earbuds with both my Mac computers and my iPhone, but recently, on my 2020 MBP with macOS Catalina 10.15.7 they just stopped outputting any sound and I can't, for some reason, use master volume slider in midi at all.
I have tried to un- and re-pair the buds but to no avail. I tried other headphones and speakers, and those all worked.  More mysteriously, the earbuds work on all of my other devices. I've also tried tampering with the format of the sound - I changed it to 1 channel (16-bit), and the Razer buds worked, but the sound was awful, like from a tin can.
Any theories as to why all of a sudden they appear as muted while using 2-channel format, and how to change that back?
I think it's always been that way, but I have no idea why.
If an output has a joint channel, like the older single speaker &quot;built-in output&quot; then it has a single master fader &amp; the two separate channels are disabled.

If it has distinct channels, then the channels are active &amp; the Master is disabled.