Hi everyone ! The subject is clear, here are the details 
Problem : Sounds from Sonic Pi goes to the HDMI screen instead of my USB Headphones (while Chromium could use my headphones to play music with any onther software).
What I did, always be sure that Sonic Pi is shutdown before every change :
Disable the HDMI sound port right clicking the headphone icon and change the settings. Before : The sound of a classic play 60 pop of the screen’s speakers
After : No sound at all.
Sonic Pi version 4.5.1, Raspbian OS based on Debian 12 on Raspberry Pi 5
If you have question to help you to help me, I’ll be glad to answer it /o/
The Pi 5 does not have a built in audio jack so you have to use a usb adapter if you want such an output as you are doinbg although in some cases hdmi monitors have a headphone jack and you can use that. The method of choosing the output audio is also different for sonic pi on a pi5 because it uses pipewire to rout audio o output. Take a look at a video I nade on the subject. This may help You can find it here The Chromium browser uses a different mechanism for audio and can be routed by right clicking the speaker icon on the top menu bar, but for sonic pi the easiset way is to use a graphical program QPWGRAPH to select the audio route,
Wonderful world of free and open source software XD
I’ll see your video and I’ll tell you if it works, thanks 
Hey, you know what ? It works and the is now a big smile on my face :3 Thanks a lot !
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