`amixer sset Master` doesnt increase and decrease both sides equally

[GitHub issues - opened <github@alsa-project.org>]

alsa-project/alsa-utils issue #279 was opened from lquenti:

I look through the issues, man pages and internet and hope I didn't miss anything. Please tell me if its a user error.

Whenever I use `amixer sset Master` to increase volume, it will not increase them evenly.

Here is a before

![before](https://github.com/user-attachments/assets/4ccfa220-608c-4407-9f6e-fc1d27f1a91b)

and after

![after](https://github.com/user-attachments/assets/250ab254-d46a-44e4-a201-58f9224b6293)

Interestingly amixer seem to think that it is still evenly balanced, although alsamixer shows that it is unbalanced afterwards.

---

Interestingly, when decreasing, the unevenness flips to the other side.

[Other people also seem to struggle with it](https://stackoverflow.com/questions/69826139/using-amixer-to-set-audio-makes-left-and-right-unbalanced) 

Thank you so much. If it is something somewhat simple to fix, I can also write a fix myself, but for now I am unsure what the problem is.

Issue URL     : https://github.com/alsa-project/alsa-utils/issues/279
Repository URL: https://github.com/alsa-project/alsa-utils