LMMS / LMMS/lmms

ZynAddSubFX Resets when closing GUI

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Dominant language
C++
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Description

When I close the GUI of ZynAddSubFX in LMMS it resets for some reason to a default sine wave

OS - Debian 12
LMMS Ver - 1.2.2


https://github.com/user-attachments/assets/e7f5f2d9-5281-44e2-b94f-748b53422331

Edit1 - This problem isnt present in some lmms projects i download off the internet, like https://gitlab.com/metalx1000/My-Music/-/blob/master/2025/UMA%20Bot%20Song%2003.mmpz?ref_type=heads

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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

No source file, test, or entry point is named. Start by reproducing the reset in LMMS 1.2.2 on Debian 12 with ZynAddSubFX, then compare the affected project with the linked project that does not show the problem. Done means closing the GUI no longer resets the instrument to a default sine wave.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
desktop
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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