I've got a karaoke system with an hdmi input and an hdmi output. It works perfectly when connecting the input to a video player or a computer, but when connected to my pi, the image go through HDMI, but the sound not.
My raspebbery is a pi 400, the sound works when connected directly to a TV, but not when using the karaoke. I tried versions bullseye 32 bits and bookworm 32 bits, with no luck.
How can I force the raspberry to output the audio to the hdmi?
I tried changing /boot/config.txt, adding hdmi_drive=2, then hdmi_group=1 or hdmi_group=4.
Nothing works, the pi is silent, clicking in the audio icon in the menu bar doesn't give any output option
