This has been bothering me for a while, but every single place in Tsukihime where it's supposed to say "wav" it says "aac". I think you messed up when converting the sound format. Is it as simple as going into the novel file and changing it?

what could have sworn I fixed that.

Please check the tsukihime bug thread (http://digital-haze.net/ch/vnds/kareha.pl/1206399055/l50)

I provided a fix for this there.