augmentative/diminutive shifting

[Jess Tauber]

Is there someone out there who has any idea when various sound-symbolic
shifts in Siouan languages became unproductive- that is, lexicalized-  in
most of the languages? Also, family-level cross-linguistic work seems to
indicate that most of such augmentive/diminutive shifts originate as bound
morphology. Has any study been done to determine etymological sources within
Siouan?  Thanks.

Sincerely,
Jess Tauber
zylogy at aol.com