Hi @riban,
I have an HiFiBerry DAC+ Pro.
Bien à vous
The display set up isn’t causing the error screen because, well, you can see the error on the screen. Pretty sure it’s going to be an issue with jack.
Hi, @professeur you have to configure your hifiberry sound card in the webconf under hardware->audio menu.
Some kind of 
is mandatory in these cases …
Regards,
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Yes “Mad Professor”
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I’m ‘reviving’ this old topic to ask a question. I’m trying to get an “official” Raspberry Pi 7 inch touchscreen working, and it generally does work.
I started with the zynthianos_2022-11-01-zynthianos-stable.img, and changed the screen to “Pi 7 Touchscreen Display 800x480” in webconf.
However, unlike the image from the thread above which has the 4 encoders represented on the touchacreen:
My main screen does not show buttons or a ‘Main’ tile:
I checked that “Enable Onscreen Buttons” under the User Interface entry from the Interface menu entry is on, and I’ve tried both the stable and testing branch.
Does anyone have suggestions as to what to look at or change? Thanks much!
Hi @tunagenes! There have been some enhancements to the touch interface with the quantity of onscreen buttons minimised to provide more screen for display of the UI.
As has (almost) always been the case, the top left of the screen (where you see “Main” on you screenshot) acts as a hidden touchpad / button. It generally acts as the BACK button but a bold press will show the menu. Most screens can be navigated / controlled using the touch interface. If you have onscreen buttons enabled then extra buttons at the bottom appear only when they are needed, e.g. in the control view the buttons allow access to presets, learn, etc.
This section of the wiki describes this (briefly). It may not say much different to what I have written here.
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Thanks @riban. I was concerned that there would some places in the user interface where I needed the encoder buttons and they wouldn’t be there. I’ll report back if that actually happens anywhere.