I made a program that converts filenames from "a_a_i_a_u_e_a.wav" to "ああいあうえあ.wav"
DOWNLOAD LINK : www.mediafire.com/download/mo1…
-- Update: Minor text fixes.
I also made a program that will snap pitchbends to the closest note for those wanting a perfect autotune effect without having to be very precise. It's not a plugin, unfortunately, but I could make it into one.