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

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