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PCM2707c problem with usb controls

Hello,

I have made ​​the circuit dac 2707c with a few tweaks. it works properly the audio output on the headset but the buttons to play / pause, next, prev, vol +, vol- etc. have no effect on the audio stream to the USB port.

In addition, I would like to know if is possible to use an SD card containing MP3 files as input audio.

thanks and please help me solve the problem.