En réponse à John Cowan :

>         Sound-change operates regularly to produce irregularity;
>         analogy operates irregularly to produce regularity.
>                 --anybody know exactly which neo-grammarian said this?

I thought it was attributed to Saussure (not a neo-grammarian stricto 
sensu, but in many ways their spiritual heir).

Christophe Grandsire.

You need a straight mind to invent a twisted conlang.