PIE stops

[Peter &/or Graham]

Steven wrote:

>What about a stop system distinguishing between voiceless, voiced, and
>aspirated (unmarked for voicing)?

It's been tried, of course (references here if you want them).   The trouble
is that it does not explain the evidence so easily.   Both the D series and
the DH series explain more phenomena if they are voiced.   Also devoicing is
easier to explain than voicing, especially if the system were indeed
unstable.   Though of course it may have been glottalic...

Peter