AppleScript to fade audio , pause music, and restore volume

Fade iTunes.workflow

set input to text returned of (display dialog "How many minutes should I play music for?" default answer "90")
delay input * 60

--- fade volume
tell application "iTunes"
	set currentvolume to the sound volume
	repeat with i from currentvolume to 0 by -2
		set the sound volume to i
		delay 0.5
	end repeat
	
	pause
	delay 2
	--- restore volume to original setting
	set sound volume to currentvolume
	-- display dialog "Volume is: " & ovol & " " & currentvolume
end tell

tell application "Finder"
	activate
	with timeout of 31 seconds
		set r to display dialog "BigMac going to sleep" buttons {"Cancel", "Sleep now"} default button "Sleep now" giving up after 30 -- seconds
		if r's gave up or r's button returned is not "Cancel" then
			-- display alert "Sleep now was clicked"
			tell application "Finder" to sleep
		end if
	end timeout
	return 30 -- seconds
end tell

osascript -e "set volume without output muted"
osascript -e "set volume with output muted"