Hi Plugs,
i think this is something special and it's beyond the scope of RuneAudio.
You can easily add your own boot sound.
1. Place your audio file in /var/local/.
We will refer to the sound file as "/var/local/startupsound.wav".
2. Create /usr/bin/startupsound.sh, with these contents:
#!/bin/sh
/usr/bin/aplay -D hw:0,0 '/var/local/startupsound.wav'
Change "hw:0,0" to your needs. You can list your sound devices with "aplay -l".
3. Make it executable:
chmod +x /usr/bin/startupsound.sh
4. Make sure it plays the sound before performing the next steps.
/usr/bin/startupsound.sh
5. Create /usr/lib/systemd/system/startupsound.service:
[Unit]
Description=Startup Sound
After=alsa-restore.target
[Service]
Type=oneshot
ExecStart=/usr/bin/startupsound.sh
[Install]
WantedBy=multi-user.target
6. Reload the systemd service files:
systemctl daemon-reload
7. Check that it is working:
systemctl start startupsound
8. Enable the sound at boot:
systemctl enable startupsound
9. Now reboot and enjoy!