This applies to the Scarlett 18i20, 18i8 and 6i6

To remove Scarlett MixControl from a mac, the following files should be moved to the trash:

• Macintosh HD/Applications/Scarlett MixControl
• Macintosh HD/System/Library/Extensions/FocusriteUSB2Audio.kext
• Macintosh HD/Library/Receipts/Focusrite USB 2 Driver.pkg
• Macintosh HD/Library/Receipts/Scarlett MixControl.pkg
• Macintosh HD/Users/[yourusername]/Library/Application Support/Focusrite*

* means you should delete the entire folder. This folder is located in the User Library. To find User Library:

1. Go to Finder (or desktop).
2. Hold the Option key on your keyboard.
3. Click the Go menu at the top of the screen.

With the Go menu open, you'll notice that pressing and releasing Option will display or hide the Library choice in this menu.