# Effect Menu: LADSPA

From Audacity Development Manual
LADSPA (Linux Audio Developer's Simple Plugin API) plugins were originally developed for the Linux platform, but ports of some plugins are available for Windows as well.

- Most LADSPA plugins are effects, but they are also used to provide some of Audacity's built-in audio generators and can be used for audio analysis.

- Additional LADSPA plugins can be downloaded for Windows and Linux. Please see the LADSPA section of the Download page on the Audacity Website for more details and links.

- LADSPA effects do not support import/export of presets but do support saving presets for use in Audacity only. A few LADSPA plugins have an "Effect Output" section which is populated after the effect is applied.

- Loading of LADSPA effects is controlled by the Plugin Manager: Effects, Generators and Analyzers dialog.

| LADSPA has been superseded by LV2 and most if not all LADSPA plugins are ancient and are no longer maintained.

## Adding a LADSPA plugin

For detailed instructions on installing LADSPA plugins for Audacity see: Installing plugins on the Audacity support site.

## Saving LADPSA effect settings as a User Preset

To save the current effect settings as a User Preset, in the effect's dialog, click the Manage button then choose Save Preset which brings up the following dialog:

Type a name for the preset then click OK after which the saved preset will appear in the "User Presets" list in the Manage menu.

## LADSPA Effect Options

In the effect's dialog, click the Manage button then choose Options to bring up the dialog illustrated below. When you change the options in this dialog, the changes apply only to the current effect that is open. All other LADSPA effects will remain at the default options shown below until you change their options.

- Latency Compensation: This setting (enabled by default) compensates for waveform delay caused by LADSPA effects which preload audio data to a buffer. Compensation may not work in all cases, and for it to work, any compensation or latency reporting settings in the effect itself must be enabled. If compensation fails or if this Audacity setting is unchecked, effects that buffer audio will insert silence at the start of the processed selection and remove a corresponding amount of audio from the end of the selection. Enabling or disabling compensation is effective immediately.

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