After taking another look at the Etruscan data and assuming there's a
genetic relationship between it and PIE I've radically revised by
proposals for the laryngeals. I still have not had a full look at the
Etruscan evidence so my proposal is highly preliminary. Furthermore I
fully acknowledge that many of my sound changes lack solid evidence.
For Proto-Indo-Tyrrhenian I propose 8 laryngeals: /?/, /h/, /?h/, /x/,
/x_w/, /W/, /kx/, and /G/. Bomhard proposes a /?H/ sound, but I have
no idea if it correlates to my /?h/ or not.

Exactly how they are reflected in PIE isn't exactly clear. Both /?/
and /?h/ are represented by h1, so I now accept that h1 is /?/. H3
appears to simply have been /G/. In Etruscan this is reflected as /r/
in non-initial position and /h/ initially so it's possible it could
have been a uvular trill instead. I find no evidence for any other
uvulars so I'm favoring /G/. The tricky one is h2 because it seems to
be a merger of /x/, /x_w/, and /kx/. I assume they all merged into
/x/. PIE may have had an h5 which I reconstruct as /W/. In Hittite
this becomes hu but elsewhere in PIE w. Finally there is h4 which is
/h/. It's also e-coloring like h1, but is reflected in Hittite as h.

--- In, anthonyappleyard2 <no_reply@...> wrote:
> anthonyappleyard2 <no_reply@> wrote:
> > My guess is:-
> > H1 was the glottal stop.
> > H2 was the voiceless epiglottal fricative heard in Arabic
> > "MuH2ammad",
> > and is sometimes transcribed as [h] with a dot under. The separate
> > form of its Arabic letter looks like a 2 rotated 180deg.
> > H3 was the ayin sound, as in Arabic [muH3allim] = "teacher". ...
> > Some say that there were two H1's. If so, then the other form was
> > the ordinary h sound.
> --- "etherman23" <etherman23@> wrote:
> > My current thinking (which presumes the Glottalic Theory and
> > Indo-Tyrrhenian Hypothesis) is that:
> > H1 was /S/
> > H2 was /h/ or perhaps /x/
> > H3 was /?/
> >
> > That H2 is /h/ is fairly well agreed upon. In Indo-Iranian it
> > aspirates preceeding stops and it is phonetically low which would
> > give it the a-coloring property.
> The /h./ sound would do this also, and (in my mouth at least) A-colors
> vowels more strongly than /h/ does.
> > My assumption that H3 is a glottal stop is based on the Glottalic
> > Theory. H3 voices stops. ...
> I find that, in my mouth at least, ayin tends to O-color vowels, and
> glottal stop does not.