Send output to both the local jack AND Bluetooth

Plex Labs
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This is a question on the output of a headless Plexamp running on a Raspberry PI 4B. I have paired a Bluetooth speaker. and I have an audio jack connected to a small FM transmitter. I am hoping to use both Bluetooth AND the jack for output without having to buy a 3.5mm Y splitter and run a separate Bluetooth transmitter for this. I was just hoping to split the signal between both. This is in preparation for Halloween and Christmas decorations.

Thank you all in advance for your ideas.

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This is probably a raspberry pi setting you need to change. Pipewire and wireplumber you might need to create a multiple output or “sink” and route the same audio stream to both bluetooth and the 3.5 headphone jack.

Or you can use Pulseaudio if you like. you can edit pulseaudio config at /etc/pulse/default.pa or similar I can’t remember off hand where it is now.

There might be some latency between the bluetooth and the wired. If you need synced you may have to tinker with the latency

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You put me on the right track. I ended up installing PulseAudio Volume Control and then ran the following command:

pactl load-module module-combine-sink

I obtained that clue from: https://askubuntu.com/questions/1379376/how-to-achieve-automated-simultaneous-outputs-with-pipewire

Then it was a matter of using the simultaneous profile that was created and setting PlexAmp to use the default.