Amend Upper Case macro to ignore brackets

I got this macro from some NG some where (Thanks), what I need help on is making the macro ignore all characters in brackets "()".
I am absolutely dying trying to mod this macro.
Heck, is it even possible?

'Change Text to Upper Case or Proper Case. See Also:
'Force Upper Case/Proper Case

'Excel has 2 built in functions for converting text to
'either UPPER CASE or Proper Case. The 2 functions that
'do this are shown below;

'=UPPER(A1)
'=PROPER(A1)

'These Excel functions work well when referring to cells
'that house the text. However, there are many instances
'when using the Worksheet Function approach is not practical.
'The Excel macro code below can be used to change existing
'text to either UPPER CASE or Proper Case. If you run the
'macro with only a single cell selected it will work on the
'entire Worksheet. If you run the macro with more than 1
'cell selected it will work on only your selection.
'The other settings that the StrConv Function take are
'shown below. See the Excel VBA help for specifics.

Sub ConvertCase()
    Dim rAcells As Range, rLoopCells As Range
    Dim lReply As Long

    'Set variable to needed cells
    If Selection.Cells.Count = 1 Then
        Set rAcells = ActiveSheet.UsedRange
    Else
        Set rAcells = Selection
    End If


    On Error Resume Next    'In case of NO text constants.
    'Set variable to all text constants
    Set rAcells = rAcells.SpecialCells(xlCellTypeConstants, xlTextValues)

    If rAcells Is Nothing Then
        MsgBox "Could not find any text."
        On Error GoTo 0
        Exit Sub
    End If

    lReply = MsgBox("Select 'Yes' for UPPER CASE or 'No' for Proper Case.", _
                    vbYesNoCancel, "OzGrid.com")
    If lReply = vbCancel Then Exit Sub

    If lReply = vbYes Then    ' Convert to Upper Case
        For Each rLoopCells In rAcells
            rLoopCells = StrConv(rLoopCells, vbUpperCase)
        Next rLoopCells
    Else    ' Convert to Proper Case
        For Each rLoopCells In rAcells
            rLoopCells = StrConv(rLoopCells, vbProperCase)
        Next rLoopCells
    End If

End Sub

As always, I value all help provided.

To the MOD who improved my title, Thanks!