Thank you. It works as we expected, however we found that we can't run two lines (left-capture - left-playback) and (right-capture - right-playback) simulatenously.

The error message is : ALSA lib pcm_dshare.c:706:(snd_pcm_dshare_open) unable to open slave cannot open output audio device right: Device or resource busy

Is there any workaround for this?