There isn't an alsa command on my system either, so that's no surprise. But we'll need more information to track down the cause, such as:
- What (sound) hardware are you using? (try lspci | grep Audio)
- What happens when you try to play a sound? Does it get stuck loading / at 0:00, show an error, or just play silently?
- Is your system using pulseaudio directly, or via pipewire? (try pactl info)
- What shows up in pavucontrol? (Is it detecting your speaker, or just "dummy output"? Is sound muted, and can you unmute?) Try also alsamixer.
- If you installed non-free firmware, you should have a few lines like deb http://deb.debian.org/debian/ bookworm main contrib non-free-firmwarein the file /etc/apt/sources.list. Ifnon-free-firmwareis not present, then obviously you have no non-free firmware.