(Still OT). Thanks, SebastianW - very interesting indeed! I'll have to see if I can find a copy of Muret-Sanders
Especially interesting to me is the description of the pronunciation of words ending in -g:
The ich-sound is met with ... c) as terminal g after consonants and front vowels: Talg, Berg, Krieg, König, Weg, trüg', zög', Zeug."
The ach-sound appears ... b) as terminal g after back vowels: Tag, bog, trug, saug.
As I mentioned in #26, that is the way I remember first hearing German spoken outside of school, in Münster (in 1962).
In any event, what I find curious is that the "standard" pronunciation apparently shifted from using the ich-sound bzw. the ach-sound for words ending in -g, to using the K-sound in all cases except words that end in -ig (e.g. zwanzig).