I tried to install Raspberry Pi OS on a Zynthian V4, but the screen is not recognized

Using Zynthian
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This is from Gemini, not @jofemodo I thought it might help:

how to route the output using a2j bridge?

To route output using an a2j bridge, you need to

use a graphical patching utility like QjackCtl or a command-line tool to connect the virtual MIDI ports created by

a2jmidid. The a2j bridge (a2jmidid) translates MIDI events between the legacy ALSA MIDI system and the more flexible JACK MIDI system.

The bridging process

  1. Enable the bridge: Run the a2jmidid daemon to export your ALSA MIDI ports to JACK.

  2. Connect the ports: Use a connection manager to route the MIDI output from the a2j client (your ALSA device) to the input of a JACK-aware application.

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You can use aconnect from the comment line to connect alsa ports.

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Thanks Riban! It’s not working properly right now. I’ll come back here as soon as I have results.