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PCM2903C: Inquiry about volume control.

Part Number: PCM2903C

Hello Expert,

Our customer is evaluating this device.

It is good work on Linux.

They can't find volume control at Line In except Line Out through Alsamixer tool.

Does this device has volume control function only for Line Out? 

Is there no function for Line In?

Could you please let me know?

Best Regards,

Michael