Private Sub Worksheet_Change(ByVal Target As Range)
    '엑셀 시트에서 "$C$5:$C$9" 범위를 "monitorRange"라는 이름으로 정의해두었습니다.
    With [monitorRange]
        If Target.Column < .Column Or Target.Column > .Column + .Columns.Count - 1 Then Exit Sub
        If Target.Row < .Row Or Target.Row > .Row + .Rows.Count - 1 Then Exit Sub
    End With
    If Target.Cells.Count > 1 Then Exit Sub
    If Target.Value = 1 Then Call testSound1
    If Target.Value = 0 Then Call testSound2
End Sub

Private Sub Worksheet_Calculate()
    Call checkChanged
End Sub

Sub checkChanged()
    Dim i As Integer
    For i = 1 To [monitorRange].Cells.Count
        If [monitorRange].Cells(i) <> [bufferRange].Cells(i) Then
            If [monitorRange].Cells(i) = 1 And [bufferRange].Cells(i) = 0 Then
                Call testSound1
            ElseIf [monitorRange].Cells(i) = 0 And [bufferRange].Cells(i) = 1 Then
                Call testSound2
            Else
                Call copyToBuffer
            End If
        End If
    Next i
End Sub

Private Sub Worksheet_Deactivate()
    Call copyToBuffer
End Sub

Sub copyToBuffer()
    [bufferRange].Value = [monitorRange].Value
End Sub

'http://support.microsoft.com/kb/158140/ko
   Declare Function sndPlaySound32 Lib "winmm.dll" Alias "sndPlaySoundA" _
       (ByVal lpszSoundName As String, ByVal uFlags As Long) As Long
   Const SND_ASYNC = &H1
  
   Sub testSound1()
       If Application.CanPlaySounds Then Call sndPlaySound32("C:\WINDOWS\Media\tada.wav", SND_ASYNC)
   End Sub
   Sub testSound2()
       If Application.CanPlaySounds Then Call sndPlaySound32("C:\WINDOWS\Media\notify.wav", SND_ASYNC)
   End Sub

'======================================================================================
'http://support.microsoft.com/kb/86281/ko

Private Declare Function sndPlaySound Lib "winmm.dll" Alias _
      "sndPlaySoundA" (ByVal lpszSoundName As String, ByVal uFlags As Long) As Long
Const SND_SYNC = &H0
Const SND_ASYNC = &H1
Const SND_NODEFAULT = &H2
Const SND_LOOP = &H8
Const SND_NOSTOP = &H10

Sub testSound1()
   SoundName$ = "C:\WINDOWS\Media\tada.wav"
   wFlags% = SND_ASYNC Or SND_NODEFAULT
   x% = sndPlaySound(SoundName$, wFlags%)
End Sub
               
Sub testSound2()
   SoundName$ = "C:\WINDOWS\Media\notify.wav"
   wFlags% = SND_ASYNC Or SND_NODEFAULT
   x% = sndPlaySound(SoundName$, wFlags%)
End Sub