It has been noted earlier in this thread that with the HA-1, you should use "DSD over PCM" in Audirvana.
But more generally, there's a user manual supplied with Audirvana Plus. When you install the application using the .dmg file, you have the ability also to copy the manual from the installer. If you didn't do that, just run the .dmg again, and drag the manual to wherever you want it to go.
And there's an Audirvana forum, at http://www.audirvana.com/forums/.
You can also search the section of Head-Fi devoted to computer software, at http://www.head-fi.org/f/46/computer-audio
Plus there's another helpful forum at http://www.computeraudiophile.com/f11-software/