Monoprice 3408 3-port DVI KVM Switch - Manual (Page 7)

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5.2.3 Beeper Enable
Hot Key:
[Scroll] → [Scroll] → [B] → [Enter] to Disable
[Scroll] → [Scroll] → [B] → [Enter] to Enable
.
The Speaker/Beeper’s default setting is “Enable”. While the switching connections
are activated and Speaker/Beeper is in “Enable” status, the beeper has a short
beeping sound.
5.3 Audio ( Speaker + Microphone ) Selection
5.3.1 ( PC+Audio ) Combination Selection
Hot Key:
[Scroll] → [Scroll] → [ F1 ]→[Enter] or
[Scroll] → [Scroll] → [ F2 ]→[Enter] or
[Scroll] → [Scroll] → [ F3 ]→[Enter]