<html> <head> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> <div class="moz-cite-prefix">On 06.05.2015 10:51, golden wrote: </div> <blockquote cite="mid:5549D618.9000000@gmail.com" type="cite"> <meta content="text/html; charset=utf-8" http-equiv="Content-Type"> <div class="moz-cite-prefix">Dear Georg, thanks for the answers, I really like your 2nd solution. But the problem is, add a another module-loopback in front speaker path, which means I need a another pair of alsa drivers (as alsa-sink.0 and alsa-source.0 in the pic), that what I have written to the alsa device, then I can read the data back from the input alsa device. It`s not a valid solution with our current hardware. </div> </blockquote> Hi, you could use a null-sink instead of alsa-sink.1 in combine-sink and then null.monitor as source for module-loopback: null-sink.monitor -> module_loopback -> alsa-sink.1 -> front speaker Or you could even play back your original audio to a null-sink and use it's monitor as input for both, processed and non-processed audio path. This would simplify your setup and you would not need alsa-sink.0 and alsa-source.0 at all. Regards Georg </body> </html>