def scanVoices(self):
        d = {}
        try: from AppKit import NSSpeechSynthesizer
        except: return {"en":""} # no -v parameter at all
        for vocId in NSSpeechSynthesizer.availableVoices():
            vocAttrib = NSSpeechSynthesizer.attributesForVoice_(vocId)
            lang = vocAttrib['VoiceLanguage']
            if '-' in lang: lang=lang[:lang.index("-")]
            if not lang in d: d[lang]=[]
            d[lang].append(vocAttrib['VoiceName'].encode('utf-8'))
        found=0 ; d2=d.copy()
        class BreakOut(Exception): pass
        # First, check for voice matches in same language beginning
        for k,v in d.items()[:]:
            if k in macVoices:
              try:
                for m in macVoices[k].split():
                  for vv in v:
                    if m.lower() == vv.lower():
                        d2[k] = [vv] ; found=1 ; del macVoices[k] ; raise BreakOut()
              except BreakOut: pass
            if len(d2[k])>1: d2[k]=[d2[k][0]]
        # Then check across languages (e.g. cant -> zh-...)
        for k,v in macVoices.items():
         try:
          for kk,vv in d.items():
            for m in v.split():
              for vvv in vv:
                if m.lower() == vvv.lower():
                  d2[k] = [vvv] ; found=1 ; raise BreakOut()
         except BreakOut: pass
        if d.keys()==['en'] and not found: return {"en":""} # just use the default
        for k,v in d2.items()[:]: d2[k]='-v "'+v[0]+'" '
        return d2