LMMS / LMMS/lmms

No sound / pipewire

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bug linux
Dominant language
C++
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Description

### System Information

NixOS 26.5

### LMMS Version(s)

LMMS 1.3.0-alpha

### Most Recent Working Version

from 25.11, sorry cannot really tell what exactly

### Bug Summary

Just updated lmms to play fresh sequence, trying to get it working, my old theme got reset and sound is broken, it shows playback in pwvucontrol with no bar being filled, cannot hear any instruments including default triple oscillator :/

BTW: I tried both Alsa and pules audio interfaces in setting, no success. Anything else works on my machine. Both llm audio modes gimme interfaces in pipe, no sound tho

How can I help ?

### Expected Behaviour

Sound working well

### Steps To Reproduce

Nixos 26.5
nix-shell -p lmms

### Logs

Logs are spamming with
```
fluidsynth: warning: No preset found on channel 7 [bank=0 prog=0]
```

No much useful info.
Tho the github template did not give me any flags to get more verbose evidence

Contributor guide

No contributing guide indexed for this repository

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the issue with `nix-shell -p lmms` on NixOS 26.5, then compare LMMS playback with pwvucontrol while checking the reported FluidSynth warnings. Done means identifying why playback produces no audible output and confirming that instruments play through the selected audio interface.

Written by the indexing model from the issue text.

Assessment

Tech stack
nixos
Domain
audio-video-rtc
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
35/100

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