LMMS / LMMS/lmms

VST effects won't load in 1.3.0

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

### Bug Summary
Version 1.3.0 alpha 1.102 doesn't support VST effects for some reason.
#### Steps to reproduce
Open track > effects > add new > click a 3rd party vst (e.g. backmask)

You will notice it instantly populates an effect tab and takes no time to load it in. Also, the `Controls` button is missing.
#### Expected behavior
How it works in 1.2.2 where it loads into LMMS.
#### Actual behavior
No button, empty tab.
#### Screenshot
![image](https://user-images.githubusercontent.com/36427968/126026462-5df21dcc-eac3-462a-b21c-20c306e49d4c.png)

#### Affected LMMS versions
latest nightly build on the website as of this posting, 1.3.0 alpha 1.102

Contributor guide

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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

Reproduce the issue using the stated path in LMMS 1.3.0 alpha 1.102 with a third-party VST such as backmask, then compare it with 1.2.2. Trace the VST effect-loading flow and determine why the effect tab is empty and the Controls button is absent; done when the plugin loads and exposes Controls as in 1.2.2.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
audio-video-rtc, desktop
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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