@MARK
That's what the OS control for volume is for.... 90% of people with this monitor a) disable the sound capability or b) use as a placeholder.
FWIW - a separate button x2 for volume up / down, would mean 8 buttons on the bottom of the monitor, and with an already odd way of workin the OSD, plus the increased potential of failure points, i think it's a fair call.
Though I do get your point, especially from a cost perspective, and it being "high tier"
But thinking about it.... I wish it didn't even HAVE built in speakers. I don't know why they even included them, probably because a 120hz of a competitor had it.
-TimJohniLL