Scanning for Plugins#

Zrythm will scan for plugins on startup and will remember those plugins until it is closed. Zrythm supports CLAP, LV2, VST2, VST3, LADSPA, DSSI and AU plugins.

SFZ and SF2 instruments are also supported, and they are scanned as instrument plugins.


Plugin scanning can be disabled by passing the ZRYTHM_SKIP_PLUGIN_SCAN environment variable when running Zrythm.

Scan Paths#

Zrythm will scan for plugins in the plugin search paths specified in the preferences. If the search path is left empty, Zrythm will scan for plugins in the standard paths according to the specifications of each plugin format (if any).


You can use environment variables (e.g., LV2_PATH) when specifying search paths in the preferences. The allowed syntax is ${ENV_VAR_NAME} where ENV_VAR_NAME is the name of the environment variable.

Plugin Cache#

Zrythm will remember scanned VST plugins and save this information in cached_plugin_descriptors.yaml in the Zrythm user path.

New plugins will be scanned on each start-up, and you can delete or edit this file to force a re-scan of previously scanned plugins.

AU Scan#

On MacOS, AU plugins will be scanned at their standard location at /Library/Audio/Plug-Ins/Components.

SFZ/SF2 Scan#

SFZ and SF2 instruments will be scanned in all directories and subdirectories specified in the preferences.

About Flatpak#

When using Zrythm as a Flatpak, only Flatpak plugins should be used (i.e., plugins using the Linux Audio base extension).


While Zrythm allows the user to use plugins not packaged as Flatpaks using the environment variables above, this is not recommended and we do not offer support if it causes issues.


Flatpak builds have no access to /usr so it is not possible to use system plugins, even when using the environment variables above.