[pulseaudio-discuss] Mixing midi output and microphone to conferencing app

[guest271314]

Are you trying to record piano and microphone input to a single audio
stream?

On Sat, Jan 16, 2021 at 9:55 AM Jan De Luyck <ml+pulseaudio at kcore.org>
wrote:

> Hi folks,
>
> I'm trying to send the output of an usb-connected plantronics headset and
> my digital piano (using midi + fluidsynth) over google meet/zoom/jitsi/..
> to the other side. I also  need to hear my piano in the headset (it has no
> speakers)
>
> I've based myself off of
> https://unix.stackexchange.com/questions/576785/redirecting-pulseaudio-sink-to-a-virtual-source
> and been testing all kinds of combinations, but I'm hitting a roadblock.
>
> The commands I'm using at the moment are:
>
>
> HEADSET="alsa_output.usb-Plantronics_Plantronics_Blackwire_3225_Series_1129BBD004004FF4BD2E6F2248C0D73E-00.analog-stereo"
>
> MIC="alsa_input.usb-Plantronics_Plantronics_Blackwire_3225_Series_1129BBD004004FF4BD2E6F2248C0D73E-00.analog-stereo"
>
> pacmd load-module module-null-sink sink_name=mix-for-virtual-mic
> sink_properties=device.description=Mix-for-Virtual-Microphone
> pacmd load-module module-combine-sink
> sink_name=virtual-microphone-and-speakers
> slaves=mix-for-virtual-mic,$HEADSET
> pacmd load-module module-loopback latency_msec=20
> sink=virtual-microphone-and-speakers source=$MIC
> pacmd load-module module-null-sink sink_name=silence
> sink_properties=device.description=silent-sink-for-echo-cancel
> pacmd load-module module-echo-cancel sink_name=virtual-microphone
> source_name=virtual-microphone source_master=mix-for-virtual-mic.monitor
> sink_master=silence aec_method=null
> source_properties=device.description=Virtual-Microphone
> sink_properties=device.description=Virtual-Microphone
>
> The effect is that I can perfectly pick the microphone "Virtual
> Microphone" in the conferencing apps, but only my keyboard is sounding
> through. My voice / mic never gets picked up.
>
> I've tried recording using
> parecord --channels=2 -d mix-for-virtual-mic.monitor /tmp/x.wav
>
> but same story, only the piano is being picked up.
>
> What did I miss? In all logic, this should work?
>
> Kind regards,
>
> Jan
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>
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