Miltassia is actually within the Oncidiinae and within the Odontoglossum alliance. This may help:
Miltassia = Miltonia x Brassia.
Tahoma Glacier is a Beallara. Beallara = Brassia x Cochlioda x Miltonia x Odontoglossum.
As to specifics, I'm not sure what this guy is, exactly, but it's a safe bet that it's got Brassia and Miltonia in its background.
So, basically, I can't give you a better guess than you've already got; all I can offer is a bit of terminological clarification.