Audio tower · floor

Audacity plugins, and the five reasons one goes missing

Installing one is usually nothing: “Most plugins get automatically activated once you install them on your system.” The interesting question is the other one — what to do when a plugin is definitely on the machine and definitely not in the menus.

Those first three are compatibility rules rather than mistakes, and they matter because none of them produces an error message. The plugin simply is not there. Ruling them out takes a minute and saves rearranging folders that were never the problem.

The second applies to any Mac that changed processor. A plugin that worked for years on one machine can be silently invisible on its replacement, and nothing about the file says so.

If the compatibility rules are satisfied and it still is not showing, the next thing is the location — and here Audacity is exact rather than approximate.

Two things are worth noticing in those three lists rather than just reading past them. The sets are not the same. Audio Unit appears only for macOS; LADSPA appears in the Windows and Linux lists and not in the macOS one. So a plugin format that is normal on one system may not be part of the arrangement on another, and a set of instructions written for a different operating system can send you to a folder that means nothing on yours.

The second is a warning Audacity attaches to the Linux VST2 entry and nowhere else: “Many VST effects are Windows-only.” That is about the plugins rather than about Audacity — a Linux user hunting for a specific effect may be hunting for something that was never built for the system.

And one instruction is repeated so consistently across all three platforms that it deserves its own box.

Nyquist is worth understanding as a separate category rather than as one more format on the list. It is the only one Audacity installs from inside Audacity, through its own menu item, and the only one that needs a restart before it works. If a set of instructions tells you to drop a Nyquist plugin into a folder, that is not the route the documentation gives.

Turning them on and off. Audacity keeps this in one place: Tools → Plugin Manager. Select what you want gone and click Disable; select it again later and click Enable. Then click OK to close the manager and save the settings — the change is not kept by closing the window another way. This is also where to look when a plugin you know you installed is not in the menus: installed and enabled are two different states, and only the second one shows up.

What this page will not do is tell you which plugins to install. That would mean running them against real recordings for long enough to have a view worth publishing, and this site does not put out verdicts it has not earned. Audacity maintains its own plugin site, linked from the same documentation page, and that is where the makers themselves point.

One thing can be said without testing anything, and it is the reason this floor exists at all. Everything above is published by the people who make the program, in a support page that names exact folders for three operating systems and states its own limits in a box headed Caution. When a maker documents this precisely, the useful thing to do is quote it rather than paraphrase it.

The floors below take it three ways: getting sound in and out, cleaning up what you recorded, and the questions that come after — what may be published, and what a recording reveals.

What this tower will not do

It will not recommend plugins. Choosing between them takes running them on real recordings, and an untested recommendation is worth less than an honest gap.

It will not give one set of folders. Audacity publishes three lists for three systems and they differ, so a single path would be wrong for most readers.

And it will not tell you a missing plugin is a bug. Audacity names five ordinary reasons, three of which produce no message at all. What holds instead is simple: the note that most plugins activate themselves, the three cautions about 32-bit and 64-bit builds, Apple Silicon and Intel, and unsupported instrument versions, the plugin folders published for Windows, macOS and Linux, the repeated instruction to copy the complete .lv2 folder, the note that many VST effects are Windows-only, the Nyquist Plugin Installer steps including the restart, and the Plugin Manager routine for disabling and enabling are quoted from Audacity’s own support documentation, listed below.