The lights can be perfect while the music comes out of the wrong speaker. Treat audio as its own part of the display: the correct file, the actual show player, a selected output, the sound equipment and the listener. Prove that complete path before opening night.
Reviewed October 29, 2026. FPP instructions refer to the current version 10 manual; Light-O-Rama instructions use its current Control Panel documentation.
Write down the sound path
For a simple speaker setup, record the player, its audio output, the connecting cable, the powered speaker or amplifier, and the audience location. If you use a transmitter and radio receiver, include both in the same list. Check equipment instructions for connector and input-level requirements.
Start at a modest level with one known-good track. Establish which device controls listening volume. Having the player, an adapter and the amplifier all at arbitrary levels makes a fault harder to trace. Keep outdoor equipment and connections within their specified installation conditions.
Use the exact media that matches the sequence
An album recording, radio edit and live performance can have different starts and timing. Match the actual file used when the sequence was built. If only one song is out of step, check its media choice and editing before changing a player-wide offset.
Keep media with your show backup and confirm it reached the show machine. In Light-O-Rama, the designated Audio folder is the normal media location. A packaged show can transfer playback content and media, but it does not replace the original editable-show backup.
Set up FPP audio
- Open the intended FPP device and confirm that the audio file is present in File Manager.
- In FPP Settings, open Audio/Video and choose the actual Audio Output Device. Supported choices depend on hardware and can include onboard audio, HDMI or a compatible USB sound card.
- Confirm a non-muted, modest player volume and the downstream equipment's selected input.
- Create a short playlist entry pairing the rendered sequence with the correct media, then start that playlist from FPP.
Listen at the actual show output. File Manager's Listen function plays audio on the browser computer. Hearing that preview does not prove the player's sound device, amplifier or transmitter works.
Begin with one output. If you later need multiple audio feeds, FPP 10's advanced PipeWire output groups provide routing and per-output adjustments. Save a working single-output configuration before adding that complexity.
Set up Light-O-Rama audio
- On the show PC, select the sound device connected to your show system and make it the Windows default playback device where appropriate.
- Check Windows' application volume mixer. Keep Light-O-Rama audible and mute unrelated notification sounds.
- Open Control Panel's Play Shows area. Check its own volume slider and speaker/mute control, which are separate from Windows and the amplifier.
- Run the real show through Show Player and listen from the audience position.
Repeat this check after connecting a dock, monitor or HDMI display. Another available playback device can change where Windows sends sound. Include the show PC's restart and normal startup routine in your rehearsal.
Find the first point where the sound goes wrong
Scroll sideways to see all columns.
| Symptom | First useful check |
|---|---|
| Lights run but no sound | Check the playlist's media association, player mute, selected output and amplifier input. Test the sound equipment with a compatible known-good source. |
| Sound is on the laptop only | Confirm that you started playback on the show player rather than a browser preview. Check the selected physical audio output. |
| Only one song is late | Compare its exact file and opening silence with the version used for sequencing. |
| Every song has a similar offset | Measure the repeatable difference using clear audio and light cues before applying a documented timing adjustment. |
| Hum, crackle or distortion | Reduce level, compare a known-good cable and isolate one section of the signal path at a time. |
Correct timing after confirming the files
Use a short test with an obvious sound and matching visible cue. Compare its beginning, middle and end. A constant difference suggests a different problem from timing that drifts during playback.
FPP provides local and remote media/sequence offsets. Change one deliberately, record the result and follow any restart prompt. Those settings affect multiple files, so repair a single incorrectly edited song at its source. Avoid compensating for the same delay in several places.
Work through hum without creating a new problem
Turn levels down before changing audio connections. Compare the shortest practical known-good signal cable, move low-level audio wiring away from power equipment, and identify whether the noise begins at the source or farther downstream. Appropriate balanced interfaces or an audio isolation transformer can help with some installations; choose them for the actual signal and equipment.
Keep protective mains grounding intact. Never remove a ground pin to quiet the sound. Noise troubleshooting belongs on the audio signal path and with qualified help where an electrical fault is suspected.
Opening-night audio test
- Run two complete songs and an announcement through the actual playlist.
- Listen for volume jumps, noise and correct timing at the normal viewing position.
- Prove that music stops when the show stops.
- Restart normally and confirm the output and volume return as intended.
- Record working settings and keep the media with your backup.
Keep our shorter audio test tip beside the opening-night checklist.
References
- FPP audio outputs and timing adjustments
- FPP media files and browser previews
- FPP sequence-and-media playlist entries
- FPP advanced audio routing
- Light-O-Rama show PC audio practices
- Light-O-Rama player volume and mute
- Light-O-Rama media file locations
- Light-O-Rama packaged shows
- Shure-hosted audio grounding and noise guide
- Shure audio transformer guidance
