Android Head Unit 4.4 main audio output to usb sound card

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Feb 10, 2010
I have an andoid head unit 4.4 10.25 screen. It's like tablet because it uses car amp. the problem was the audio output of unit doesnt working. I had buy a usb sound card, I connected it in usb of unit and i conncected with jack 3.5mm to aux of car. But only with Onkyo HF Player can play music because only that app recognize the usb audio device. I have rooted the device and tested many apps but nothing works. I need an app to change default audio out from speakers to usb sound card. Can you help me?
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