Adding DC offset to one channel in alsa config

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Hi,

Please is there a way to add a fixed DC offset to one channel stream in alsa config (.asoundrc)?

We are playing with single-ended -> virtual balanced setup ( http://www.diyaudio.com/forums/pc-based/326747-virtual-balanced-regular-soundcard-linux-results.html ) using the route plugin. The setup works surprisingly nice.

Unless one of the input channel AD convertors has a DC offset which ruins the subtracted signal. It is easy to measure the offset.

Such as e.g.

type route
ttable {
		 0.0= 0.49 + 0.001
		 0.1= -0.49
	}


Thanks a lot for any suggestions.


Best regards,

Pavel.
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