I was annoyed, that BetterDisplay is playing a sound feedback, when I use option-shift volume up/down to get finer adjustment steps.

The sound doesn't play, when just the volume keys are used. While looking, if this issue was already reported, I found "Play feedback when volume is changed" #1559. There it states "... then figured out there is a modifier key (shift) which should invert whether the sound is heard or not."

And indeed, that is the problem. The setting "Play feedback when volume is changed" in the Settings-App is off for me (I didn't know that setting existed). When I switch it on, the sound is playing when just the volumes keys are used and no sound when option-shift is used.

A test on my MacBook Air M2 without BetterDisplay shows, that the setting is only inverted, if shift is the only modifier key pressed. With option-shift pressed together, the setting is used unmodified.

It would be great if BetterDisplay behaved the same way and invert the setting only, when option-shift was pressed. So it stays quiet for me.