yes if you choose and AC3 or DTS file autorv10 will use the NicAudio plugin to open it directly from the .avs file no more tempory wav file. And of course you could still apply some transformation like to downmix the 5.1ch file to a 2.0 channel file and also the possibility to upmix a 2.0 file in a 5.1ch audio stream.
And you also have an audio preview in stereo mode.
I have made a bunch of tests but if you found a strange beheviours feel free to post a msg
Bye.