On 06.05.2015 10:51, golden wrote: > 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. > 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 -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.freedesktop.org/archives/pulseaudio-discuss/attachments/20150506/4ebc97c3/attachment.html>