NetSiouan

[Koontz John E]

NetSiouan is a rubric for a technique of representing languages with
Siouan phonologies in ASCII for distribution over an ASCII mail channel. 

Nasal vowels:    VN, with a capital N          saN
                 V~                            sa~

Accented vowels: V'                            wasa'be
                                               isaN'ge

Voiced stops                                    be,  je, j^e,    de,  ge
Aspirated stops  Ch                            phe, che, c^he,  the, khe
Ejective stops   C?                            p?e, c?e, c^he,  t?e, k?e
Preaspirates     hC                            hpe, hce, hc^e,  hte, hke  
Geminates        CC                            ppe, cce, c^c^e, tte, kke

The use of ^ (pseudo-hacek) is optional!

Voiceless Fricatives                                t^e, se, s^e, xe
Voiced Fricatives                                   d^e, ze, z^e, g^e ~
                                                                  ghe
Glottalized Fricatives                               t^?e, s?e, s^?e, x?e

The t^ and d^ are theta and eta.  

Here the use of ^ isn't optional, unless you know you can get away with
sh and zh.  In general ^ and h are interchangeable as "diacritics" unless
there's a problem with ambiguity.  So usually th won't work for t^, but dh
will work for d^.  

Enye n~ or ny  
Eng n^
Glottal stop ?

Anything not mentioned used the standard character (w, y, h, m, n, etc.).

There are no hard and fast rules.  Just use standard notation, but use N
for nasal hook/raised n, whatever, and ^ or h (if possible) for
essentially all diacritics.  It's pretty ugly, but it seems to work. 

I have another summary at http://spot.colorado.edu/~koontz/faq.htm