Adding and Removing Files From the Queue
All the ways to get audio into MP3 Encoder — and to clear the queue when you're done.
MP3 Encoder limits the file types that can be added based on the file's extension. For the complete list, see Supported File Extensions. When a folder is added, MP3 Encoder searches through it and all of its subfolders and adds every supported file it finds.
Four Ways to Add Files
1. Via the File Menu
In the File menu, choose Add Files (⌘O). This brings up an Open File dialog where you can select files or folders to add.

2. The Add Files Toolbar Button
Pressing the Add Files toolbar button has the same effect as choosing Add Files from the File menu.
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3. Drag and Drop
Files and folders can be dragged directly onto MP3 Encoder's main window or onto its Dock icon.
4. Drag Directly From iTunes
Files can be dragged straight out of iTunes and onto MP3 Encoder's interface or Dock icon.
Removing Files
The simplest way to remove every file from the queue is to press the Clear Files button. To remove only certain files, select the ones you want to remove and press the Remove Files button.
You can select multiple files by holding ⌘ (Command) while clicking. You can also select a range of files by holding ⇧ (Shift) and clicking on the first and last file in the range.