micky wrote:
Got new used car with new used radio

Regarding balance and fade contols, which pop out for adjustment and
then can be pushed in, so that only a little sticks out:

"Adjust the balance (or fade, for the other button) and push the button
back in. The balance (or fade) will be displayed and continuously
updated while the button is pressed".

What does this mean?

Can you rotate the button with finger tip while pushing on it or when pushed in?