Andy, I tried your method of RawFeature=+expt, but it didn't work. Finally, I discovered that the package genzi.sty (by Kazuomi Kuniyoshi), somehow interfered. After disabling genzi.sty, your code worked perfectly, producing the alternate glyph I wanted.
Analyzing the genzi.sty code is way beyond me, so I guess I'll forgo the alternates until XeTeX incorporates the variant selector feature. Many thanks for your help. -------------------------------------------------- Subscriptions, Archive, and List information, etc.: http://tug.org/mailman/listinfo/xetex
