Play and fade the current iTunes track

FadeTrack.scpt

--
--	Created by: Alan Duncan
--	Created on: 2018-01-11
--
--	Copyright (c) 2018 OjisanSeiuchi
--	All Rights Reserved
--

use AppleScript version "2.4" -- Yosemite (10.10) or later
use scripting additions

property minimumVolume : 10

--	initial volume, set by user
global volume0, trackRepeatMode0

on run
	set trackDuration to the text returned of (display dialog "Minutes to play track?" default answer "5")
	tell application "iTunes"
		set volume0 to sound volume
		set trackRepeatMode0 to song repeat
		
		-- probe to see that we have a track selected
		try
			set t to the current track
		on error errMsg number errNum
			if errNum is -1728 then
				display dialog "Please select a track first"
			else
				display dialog "Unable to begin playback"
			end if
			return
		end try
		
		--	set track repeat 1
		set song repeat to one
		--	begin playing track
		set player position to 0
		play
		
		--	calculate the delay between fades
		set fadeDelay to (trackDuration * 60) / (volume0 - minimumVolume)
		repeat with i from minimumVolume to volume0
			delay fadeDelay
			set sound volume to (sound volume) - 1
		end repeat
		
		--	stop playing
		pause
		set player position to 0
		
		-- restore iTunes settings
		set sound volume to volume0
		set song repeat to trackRepeatMode0
		
		quit me
	end tell
end run