Thank you for this wonderful system extension @krlvm,

I'd like to suggest the following meaningful enhancements for the future release (feature request):

1. An optional CLI switch (or INF file value) so volume changing would work when mouse wheel is spinned while Alt key is held pressed. This will make the application usable in fullscreen programs, i.e. in games or audio visualizers.
2. An optional CLI switch (or INF file value) to specify percentage of change done by each wheel spin, i.e. 10% instead of 1%. This may be doable because Windows 10's default system fly-out menu uses 2% volume change increment when mouse wheel is spinned.

P.S. There's an outdated Media Flyout reference in the installer of TrayVolumeControl's version 1.1.1 Install.cmd. Perhaps it should be removed as obsolete.

P.P.S. Maybe TrayBrightnessControl can be developed as well? The display brightness flyout is inside Action Center flyout and this is quite inconvenient. I also couldn't find any application to achieve this except ClickMonitorDDC but it's quite resource heavy for such simple task (and it's discontinued and removed from the Internet).