Custom Volume Buttons and Custom Volume tray icons

#include "SoundGetSetQuery.au3"
Global $bState=False,$aIcon[4]=["low.ico","med.ico","max.ico","mute.ico"]
$iVolume=_SoundGet(0, "dSpeakers", 1, "Volume")
If $iVolume<=33 Then TraySetIcon($aIcon[0])
If $iVolume>33 And $iVolume<=66 Then TraySetIcon($aIcon[1])
If $iVolume>66 And $iVolume<=100 Then TraySetIcon($aIcon[2])
HotKeySet("{PGUP}","up")
HotKeySet("{PGDN}","down")
HotKeySet("{INS}","mute")
Func up()

    If $bState==False Then
        $iVolume=_SoundGet(0, "dSpeakers", 1, "Volume")
        Send("{VOLUME_UP}")
        If $iVolume<=33 Then TraySetIcon($aIcon[0])
        If $iVolume>33 And $iVolume<=66 Then TraySetIcon($aIcon[1])
        If $iVolume>66 And $iVolume<=100 Then TraySetIcon($aIcon[2])
    EndIf
EndFunc
Func down()
    If $bState==False Then
        $iVolume=_SoundGet(0, "dSpeakers", 1, "Volume")
        Send("{VOLUME_DOWN}")
        If $iVolume>=1 And $iVolume<=33 Then TraySetIcon($aIcon[0])
        If $iVolume>33 And $iVolume<=66 Then TraySetIcon($aIcon[1])
        If $iVolume>66 And $iVolume<=100 Then TraySetIcon($aIcon[2])
        If $iVolume==0 Then TraySetIcon($aIcon[3])
    EndIf
EndFunc
Func mute()
    If $bState==True Then
        $iVolume=_SoundGet(0, "dSpeakers", 1, "Volume")
        Send("{VOLUME_MUTE}")
        If $iVolume>=1 And $iVolume<=33 Then TraySetIcon($aIcon[0])
        If $iVolume>33 And $iVolume<=66 Then TraySetIcon($aIcon[1])
        If $iVolume>66 And $iVolume<=100 Then TraySetIcon($aIcon[2])
        If $iVolume==0 Then TraySetIcon($aIcon[3])
        $bState=False
    Else
        Send("{VOLUME_MUTE}")
        TraySetIcon($aIcon[3])
        $bState=True
    EndIf
EndFunc
While True
    Sleep(10)
WEnd