[pulseaudio-discuss] Connecting two sound cards mic A to speaker B and mic B to speaker A

Craig Matsuura cmatsuura at vivint.com
Fri Jan 31 18:36:08 PST 2014

Thanks for the link on the FAQ.  Very helpful.  I reviewed the FAQ and did not find anything I thought would help me with the next problem.

I know have my two cards connected.  I will want to monitor one of the output channels so I can decode DTMF, my current setup is as follows based on the FAQ for connecting sink and source.

pactl load-module module-loopback source="alsa_input.pci-0000_00_1b.0.analog-stereo" sink="alsa_output.usb-0d8c_C-Media_USB_Headphone_Set-00-Set.iec958-stereo"
pactl load-module module-loopback source="alsa_input.usb-0d8c_C-Media_USB_Headphone_Set-00-Set.analog-mono" sink="alsa_output.pci-0000_00_1b.0.analog-stereo"

The above to commands allow me to connect the sink/source from one card to another.  I now want to listen in while connected to detect DTMF tones or possibly other audio capture.  How can I do this keeping my two cards connected as above?


On 01/29/2014 10:16 PM, Craig Matsuura wrote:

I apologize if this has been answered.

I've been digging around looking for a good way under Linux to connect up to sound cards that are ALSA devices.

Sound card A has a Mic and Speaker and Sound card B has a Mic and Speaker.

I want to connect Sound card A Mic to Sound card B Speaker and Sound card B Mic to Sound card A speaker.

A Mic --> B Speaker

A Speaker <-- B Mic

I assume I can do such configuration with PulseAudio, but I'm new to PulseAudio custom setups.

I have briefly played with the pactl program.  I would think this can all be accomplished with the pactl program and the proper commandline parameters.


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