Avid recently updated a bunch of hardware and software (see this post on Macrumors.com for full details) but the one point I found interesting is that the new versions of their Fast Track Solo and Fast Track Duo include the ability to plug into iPad 2 or newer or iPad minis.

Screenshots

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I have an older Fast Track series audio device and they work great as portable recording studios for podcasting or music production. Paired with GarageBand for iOS ($4.99 in the App Store) it's crazy how powerful a recording studio you could have in your backpack.