LMMS / LMMS/lmms

Audible click when switching effect on/off or effect parameters via automation track

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bug
Dominant language
C++
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Avg merge
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Merged PRs (30d)
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Description

### Bug Summary

Short noise/click is generated during automation track assisted switching of
* effect on/off ( C* Cabinet I-IV tested )
* C* Cabinet I-IV model type
* C* AmpVTS model type
* Dual filter's filter type (Hi-pass, Low-pass, ... )
* ZynAddSubFX distorsion's distorsion type

Click friendly instruments
* ZynAddSubFX
* SID
* Organic

Clicks are visible on "Spectrum Analyzer" and hearable on play or rendered track.
Looks like "knob" type controls are not affected ( volume, pan, freq, ... )

#### Steps to reproduce
example https://disk.yandex.com/d/Z2smVIGIoM9GpA

#### Expected behavior
no click
#### Actual behavior
click
#### Screenshot

#### Affected LMMS versions
current master
LMMS 1.3.0-alpha.1.517+gc2052151a
(Linux x86_64, Qt 5.15.12, GCC 13.2.0)

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 attached example with automation-track switching and compare playback or rendering with the Spectrum Analyzer. Trace the handling of effect on/off and model or filter-type changes, then verify that these switches no longer produce an audible or visible click while knob controls remain unaffected.

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
Mostly clear
Newbie friendliness
30/100

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