unable to adjust Bass speaker in alsamixer

[papapenguin]

my computer has a configuration of 2 tweeters and 2 speakers. I only have output from the 2 tweeters.

ASUS ROG Zephyrus G14 GA401QH

2x 2.5W speaker with Smart Amp Technology
2x 0.7W tweeter

Kubuntu 24.04
Kernel 6.8.0-88-generic

I can see the Bass speaker in alsamixer, but I cannot adjust the output.

Any suggestions?

[jlittle]

You are using the arrow keys?

[papapenguin]

You are using the arrow keys?

yes, as you see there is no vertical bar above Bass speaker either