Untested but perhaps:
Private Declare Function sndPlaySound32 Lib "winmm.dll" Alias _
"sndPlaySoundA" (ByVal lpszSoundName As String, _
ByVal uFlags As Long) As Long
Private Sub Workbook_SheetCalculate(ByVal Sh As Object)
Dim lngRow As Long
Static onlyonce As Boolean
If onlyonce Then Exit Sub
Rem Pairs: H50 & H51, H102 & H103, H154 & H155, and H206 & H207
For lngRow = 50 To 206 Step 52
If onlyonce Then Exit Sub
If Cells(lngRow, "H") <> "" And Cells(lngRow, "H") <> 0 Then
If Cells(lngRow, "H") = Cells(lngRow + 1, "H") Then
sndPlaySound32 "ding", 1&
onlyonce = True
End If
End If
Next lngRow
End Sub
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