press-key-in-other-app.scpt

on run {input, parameters}
	global currentProcess
	
	tell application "System Events"
		--set currentProcess to the name of the first process where it is frontmost
		set currentProcess to (path to frontmost application as text)
	end tell
	
	activate application "VirtualBoxVM"
	
	tell application "System Events"
		try
			-- toggle mic
			keystroke "=" using {control down}
		on error
			key up {{control, shift, option, command}}
		end try
	end tell
	
	activate application currentProcess
end run