I'd been wondering why some forms with final vd.stops show lenition (e.g. *-ib > iw) while others do not (e.g. *-ib via **i:b or **-iwb then **i:p, **-iwp, ult. modern /-i? ~i:? ~˙?/. Surely not just the usual culprit, dialect borrowing.... Now I know: it's due to ancient fossilized morphology-- some C (voiced; a nasal?), that perhaps marked some case or other. Thus *-ib# lenits, but *ib+C does not, in fact the lengthening/breaking is compensatory. (And if the final is vl, the +C will voice it, non-leniting) There are already fossilized derivational prefixes, m-, s-, i- or infix -y- and others yet to be inven...er, discovered, that produce variant forms. Another discovery just last night: the ancient God of Healing is called /ah tiN/, < *as pirín ;-)) The modern medical guild/association will be _ah ting GUILD_. A couple bright spots in the really boring process of summarizing ALL the damn sound changes. The "Proto (Baw Da) Gwr" I'm working with is probably comparable to Proto-Italic; we have yet to find the PIE equivalent.