[alsa-devel] Adding DC offset to one channel in alsa config

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-soun... ) 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.