An aggregate audio device allows you to combine multiple interfaces and access them as one unit. So, for example, if you have one interface with 2 inputs and 2 outputs and another with 4 inputs and 2 outputs, you can set them up as an aggregate device so that your …

As you probably already know, a lot of audio program preferences are in the User -> Library folder on the Mac OS X operating system. However, if you are working on the Lion operating system, this folder is hidden by default.

You can 'un-hide' the Library folder by opening the Terminal …