if ($o->GetObjType() == "Note" && ($t =& $o->GetTaggedOpt("Pos"))) {
        // parse the pos option string
        $npp = new NWC2NotePitchPos($t);

        while ($npp->Position > 13)
                $npp->Position -= 7;

        while ($npp->Position < -6)
                $npp->Position += 7;

        $t = $npp->ReconstructClipText();
}