> Thanks for extra detail, Haukur! I hope I got the rest of
> pronunciation stuff more or less right...

Yes, it was perfect. I rarely see any reason to comment on your posts
because you tend to get everything correct and explain it very clearly.

> So, it's gone from 'hald' to 'halt' by the final devoicing rule (as in
> 'band' > 'batt', etc.), then back to 'hald' (in theory [
> http://www.lexis.hi.is/beygingarlysing/so/sb/halda.html ]) by analogy
> with forms where 'd' remained, then back to 'halt þú' by analogy with
> 'haltu'?

Yes. That's my understanding, at any rate. I've never read anything on
this last analogical change, though, it's just my own observation.

> Interesting... We met with a similar phenomenon in the last section
> of Njáls saga we looked at: the modern 2nd person indicative 'þú
> sérð', as opposed to the older 'þú sér'.

Quite! Apt comparison.

Kveðja,
Haukur