New answers tagged volume
That kind of "Mixer" doesn't seem to be possible. Quoting from the description of App Volume (thanks to Fiksdal for pointing to this comment): Android manages one stream for all apps, so we can't set different volume levels at same time for two different apps. So at the very best, you could set different volumes for different apps. Again, there's ...
You can try a remote control app that would allow you to control anything on your android phone from your computer. If you are okay with this approach you can try app called Vysor - Android control on PC.
As far as I know, this could be changed simply by buttons on the side of the phone at the moment you are calling.
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