1. Run the installer on your pi, for example:

  curl https://tri.jahschwa.com/link/spectrum | sudo bash 

2. Restart kodi, for example:

  sudo killall kodi.bin

2. On your TV, navigate through Kodi's settings to:

  Settings > Add-ons > My add-ons > Look and Feel > Visualization

3. Select "OpenGL Spectrum"

4. Select "Enable"

5. Select "Use"

6. Profit