There are three major dialects of Irish: Ulster Irish, Connaught Irish and Munster Irish. Although they share many grammatical features there are notable differences too. The most striking difference is the pronunciation. It's immediately clear which dialect we're dealing with as soon as a native speaker starts to speak. There is no such thing as a received pronunciation in Irish - although there is a written standard.
Thus, when developing a synthesiser for Irish a voice for each one of the (major) dialects has to be created. So far we have three voices: Gweedore (Ulster), Ráth Chairn (Connaught) and the Dingle Peninsula (Munster).
We intend to provide more voices, especially voices for the various sub-dialects (e.g. Mayo Irish or Waterford Irish). We strongly encourage native speakers of any of the major dialects or any of the sub-dialects to contact us.
Source: Wikipedia