Use standard library style members of wxArrayString (and wxString) ...

... which will make it easier to change the types of those containers to
std::vectors of other string-like classes

for wxString,

IsEmpty => empty
Clear => clear
Alloc => reserve

for wxArrayString,

Count => size
GetCount => size
IsEmpty => empty
Add => push_back
Clear => clear
Empty => clear
Sort => std::sort (only with default comparator)
SetCount => resize
Last => back
Item => operator []
Alloc => reserve

src/export/ExportMP2.cpp

@@ -104,7 +104,7 @@ ExportMP2Options::ExportMP2Options(wxWindow *parent, int WXUNUSED(format))
 {
    for (unsigned int i=0; i < (sizeof(iBitrates)/sizeof(int)); i++)
    {
-      mBitRateNames.Add(wxString::Format(_("%i kbps"),iBitrates[i]));
+      mBitRateNames.push_back(wxString::Format(_("%i kbps"),iBitrates[i]));
       mBitRateLabels.push_back(iBitrates[i]);
    }