One of the great things about Apple’s Operating System is the ability to combine audio interfaces into a virtual interface. Apple refers to it as an aggregate device. The term aggregate basically means a collection or a sum of objects into a whole. This is what happens when you create an aggregate device. The inputs and outputs of multiple audio interfaces are combined into one.
With the case of Audiomux, you can create an aggregate device that combines the inputs and outputs of your iOS with an audio interface resulting in the ability to use them together inside your DAW of choice.
This makes it easier since you will no longer be required to switch interfaces during a recording session, breaking up creative process. One thing to notes is the device that has the lowest sample rate will set the sample rate. In the case of using the Akai EIE, any devices that are combined with it will only record at 44.1 even if it’s capable of recording at higher rates.
The following video shows how this is setup but if you have any further questions please do not hesitate to ask.