An AutoHotKey script to mute/unmute all microphones on a system level. Works with Windows 10.

mic-toggle.ahk

; An AutoHotKey script to mute/unmute all microphones on a system level. Toggle with Caps Lock.
; Emits a single beep on mute, double on unmute. Tray icon changes accordingly.
; Requires https://www.nirsoft.net/articles/mute_microphone_command_line.html
; Note: SoundSet doesn't work as intented
; TODO: detect tap and hold to speak, based on https://github.com/YoYo-Pete/AutoHotKeys/blob/master/PushToTalk.ahk
; https://www.howtogeek.com/446418/how-to-use-caps-lock-as-a-modifier-key-on-windows/
; also https://stackoverflow.com/questions/1794258/detect-a-double-key-press-in-autohotkey


$Capslock::
	toggle := !toggle
	If toggle {
		Sleep 500 ; mute with a small delay to avoid cut-off words
		SoundBeep, 500
		Menu, Tray, Tip, Mic Muted
		Menu, Tray, Icon, SndVol.exe, 3, 1
		Run "C:\portable\SoundVolumeView\SoundVolumeView.exe" /Mute "DefaultCaptureDevice"
	}
	else {
		SoundBeep, 900
		SoundBeep, 900
		Menu, Tray, Tip, Mic Active
		Menu, Tray, Icon, SndVol.exe, 2, 1
		Run "C:\portable\SoundVolumeView\SoundVolumeView.exe" /Unmute "DefaultCaptureDevice"
	}
	Return

Although useful in a pinch, this script is not very reliable. On computers with multiple microphone devices, it only motes the default and going through all available devices doesn't seem easy or effective.