Hi pulseaudio forks, Sorry to ask silly questions again. I need some advice from you guys. I have a front alsa sink and a rear alsa sink, right now, I`m using pa_stream connected to the front alsa sink, then I want to make the pa_stream both output to front and rear alsa sink. Here is the pipeline before move: pa_stream -> sink-input -> front alsa sink What I am doing is create a new combine-sink, and make the combine-sink connected with front and alsa sink, then move the sink input of pa_stream from front to combine-sink Here is the pipeline after move: -> sink-input -> front alsa sink pa_stream -> sink-input -> combine-sink -> sink-input -> rear alsa sink I have dump all the data written to the front alsa sink, There is a very small time of silence has been written to front alsa sink after pa_sink_input_move_to (about 20 ms), I think that might be the latency of speex resampler (to adjust the rates of sink-input in combine-sink). Do you have any advice to avoid this kind of noise ? Thanks! BR, Lixin