[Q] Atrix and digital audio out via USB or mini HDMI - Atrix 4G Q&A, Help & Troubleshooting

Hello to all,
From what i've read, host mode USB is enabled only in 3.1 and up, but i'm wondering if anyone has had some form of success in getting digital audio out to a DAC via USB on phone or multimedia dock, or the HDMI?
Thanks

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Hi all,
I have the Note 2, it is not rooted and full stock. I purchased the Allshare Dongle and I did update the dongle firmware. I can get video over HDMI but no audio using media player or spotify. I tried 2 different HDMI cables. I tried going direct to TV and bypassing the HDMI receiver to which the TV is connected. I tried going to Accessory Settings and trying both Stereo and Surround.
Seems like this should be obvious but its not. I get audio from phone until I turn on allshare cast, and then I get no audio from the phone (as it should be because HDMI is then active) - but there is no HDMI audio.
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[Q] Force Audio out via USB

I'm part way through completing an Audio/Charging cable for my car and was wondering if there was a way to force audio out via the USB instead of relying on the phone checking for the required voltage to put it into dock mode.
Reason being I want to troubleshoot my setup and be sure that the phone is trying to output audio via the USB port, my USB flex is faulty (I think) so I'm not sure if the sound isn't working because the ROM doesn't support audio out, if the cable I made doesn't work, the phone es faulty etc, if I can force audio over the dock then I know the problem is with the phone.
I've tried a few car mode apps but I don't know if they activate the audio out via USB mode or not.
I'm running Supernexus M1 (4.2) as my ROM if that matters.
Thanks,
Auzeras

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