I read on another website they said 20k. I measure myself and got 12k. If it needs a signal to ground through a resistor, stronger should work, but weaker may not, thus the 10k.
I also noticed that in the commands is a mute command, I’m thinking in the Setup button, having volume and mute settings. Things you can set once, and I’ll make sure happen on boot. Maybe that is the missing link?