Macros Palette
You can apply any of the existing macros using the Macros Palette. To open it you can either:
Use the menu Tools > Apply Macros > Palette, or
Use the Shrink button in the Manage Macros dialog
Once invoked, the Macros Palette window will remain on-screen, actively available, at all times unless and until you dismiss it or close Audacity.
Select Macro
In the "Macro" list, left-click on a Macro (or use Up or Down keyboard arrow) to select the Macro you want to apply.
Apply Macro to
Project
Use the Project button to apply the selected Macro to the current project.
The typical purpose of this option is effect automation - apply a sequence of effects to the project, using effect parameters and an order of applying the effects that you have found to work well for the type of audio you are processing. This saves time and provides consistency in your workflow.
The effects in the Macro are applied to the selected region of waveform in the selected audio tracks. Usually the selected Macro would not include an export command so as to use the greater flexibility of the Export Audio Dialog.
If an export command is included in the Macro, the entire project audio is exported irrespective of track or region selection. Therefore if the project contains multiple audio tracks, they will be mixed together, unless any of the tracks are muted on the Track Control Panel.
If the project has been Saved, then the exported files will be saved in a folder named macro-output. The macro-output folder will be in the location specified in Directories Preferences.
If the audio in the project came from an imported file as its initial step (that is, it is a named project), the macro-output folder will also be in the location specified in Directories Preferences.
If the project has not been saved and is un-named, the normal Export Audio dialog will appear enabling you to choose the name and location of the exported file.
Macros will work on pre-existing selections you make in your project prior to running the Macro. But the selection can be over-ridden by your Macro itself as there are macro commands available to effect selections in the audio. In particular All(Select All) will select the entire project and Select which is parameterizable (see the provided Fade Ends Macro for an example where the first and last one seconds of the audio are selected for the fades).
Files...
The typical purpose of this option is batch processing - apply the Macro to multiple audio files so as to apply one or more effects to them, and/or convert them to another file format. You can convert from any file format supported by Audacity to WAV, MP3, OGG or FLAC.
Use the Files... button to apply the selected Macro to selected external audio files that are in a single directory.
If you already have audio in the current project window, you must save and close that project using File > Close before applying a Macro to files.
You cannot apply a Macro to multiple Audacity AUP3 project files, instead you need to use Python scripting.
The selected Macro must include an Export step, otherwise the processed audio will not be retained.
You cannot process multi-channel audio files (for example, 5.1 surround sound files) using Macros, even if Import / Export Preferences has been set to "Use custom mix". Any multi-channel files you import will be mixed down on export.
A standard File Open dialog box will appear. Choose a directory then you can select one or any number of supported audio files in that directory, including older AUP project files (but not AUP3 project files).
You cannot select files outside that directory, and files in folders inside that directory will not be processed.
It is convenient therefore to first put all the audio files you want to process into one folder before applying the Macro.
After selecting the audio files you want to process, choose Open.
Each file will be imported into Audacity and processed, exported to the format you chose in the Macro, then the processed audio will be removed so as to clear the temporary disk space that had been used.
The exported files will be saved in a folder named "macro-output" in the folder specified in the Macro output field in Directories Preferences. The original files are not altered.
If you leave the entry for Macro output blank in Directories Preferences then Audacity will default to creating a folder called "macro-output" in:
Windows: C:\Users\<your username>\Documents\Audacity
Mac: /Users/<your username>/Documents
Linux: /home/<your username>/Documents
When a Macro is applied to files, the only option is to import and process the entire file. Thus the entire file will be exported unless an action or effect in the Macro (such as Cut or Truncate Silence) removes some audio.
If modifying the audio before exporting, the Select Time function may be useful to select audio to remove or modify.
Some optional Nyquist plugins have parameters to trim or extend audio by a specific length and Nyquist can do calculations too, so it may be helpful to use Nyquist plugins from within a macro.
It is recommended not to process more than 500 files at a time.
The buttons
Expand
Use the Expand to return to the full-size, full-function Manage Macros dialog.
The apply Macro buttons are also available on the Manage Macros dialog - so all Macro operations can be made from that full dialog.
Cancel to exit the dialog
To dismiss the dialog simply click on the Cancel button
Otherwise the dialog will remain open on the screen, but allowing you to perform other Audacity functions.