It's been a while since I've wrote about issues concerning Aegean or Etruscan linguistics. However, lately the issue of lost vowels in Pre-Etruscan Syncope sprang to my busy mind.
Many suffixes that are consonant-final in Etruscan appear to come from vowel-terminating suffixes at some Pre-Etruscan. In fact the vowels were probably lost at a stage when Rhaetic, Lemnian and Etruscan were still the same undifferentiated tongue. So far, I think I can ascertain what some of these lost vowels were in some suffixes and words. For example, the Etruscan derivational suffix -aχ appears to have been in origin *-aku. “How can I be so certain?” you ask? Luckily, alternations exposing the past are still present in Etruscan such as seen in *araχ “falcon, hawk” (glossed as arakos by Hesychius) versus aracuna “(one) of the hawks or falcons” where former *u is preserved when the pertinentive suffix -na is attached. I've also ascertained so far that the intransitive participle -θ was once *-ta whereas the homophonous agentive suffix -θ (as in the names Aranθ and Vanθ) was once *-ti. I could be wrong but that's my theory so far.
Since all vowels seem to equally disappear word-finally during Pre-Etruscan Syncope, I would naturally assume that the transitive participle suffix -u must consequently come from an earlier diphthong *-au. In Minoan, this ending may indeed be preserved as a diphthong in the inscribed word DI-NA-U /'tʃinaw/ “moulded” in inscription HT 16 for example (c.f. Etruscan zinu).
That's where I'm at in regards to Pre-Etruscan Syncope so far but I still have a lot more questions to answer (and it certainly would be nice if an extensive Minoan document floated our way soon in order to make its translation a helluvalot easier).