[popcornmix]

BTW Audio DSP add-on should be working in latest build. Some info here.
I believe "Audio DSP Basic Processor" and "Free Surround Processor" should work, but not "Biquad filters" yet.
Make sure omxplayer and passthrough are disabled. Enable in system/audio settings, and you can configure the add-on from audio OSD when playing a video.
You may need to enable the add-ons in Add-on browser/My Add-ons/Audio DSP.