FluidSynth as a background service

Required if you need MIDI support in any of your Wine/Proton software

Install FluidSynth

sudo rpm-ostree install fluidsynth

If you have vlc layered you should also install vlc fluidsynth plugin to play midis in vlc

sudo rpm-ostree install vlc-plugin-fluidsynth

Now reboot

systemctl reboot

Download gm.sf2 from here https://musical-artifacts.com/artifacts/713 and put it somewhere e.g. /opt/soundfonts/

Edit fluidsynth configuration:

sudo vim /etc/sysconfig/fluidsynth

# Mandatory parameters (uncomment and edit)
SOUND_FONT=/opt/soundfonts/gm.sf2

# Additional optional parameters (may be useful, see 'man fluidsynth' for further info)
OTHER_OPTS='-a pipewire -r 48000 -z 512'

Enable fluidsynth user service and verify status:

systemctl enable --now --user fluidsynth.service
systemctl --user status fluidsynth.service

Do not use alsa or pulseaudio outputs with fluidsynth because they don't work properly and cause the MIDI player to randomly break.