[Martijn]

Here are some 5.1 96khz/24 bit flac sample to test: http://www.2l.no/hires/ (see the user + password at the beginning of the page).

I can reproduce: ActiveAE: nothing SoftAE: Stereo

This should work now. ac3 is limited to 32,41,48khz. If sampling rate is greater 48khz, I set it to 48 now.
Should we bother the user with another setting? What do you prefer when playing a 5.1 96khz sample if your spdif supports 96khz? downmix to 2 channels or keep 5.1 and resample to 48khz?

Keep 5.1 and resample