There has yet to be a comparison of audio interfaces for iPads. I can't get manufacturers to respond to emails when I'm not asking for things, so I haven't considered the possibility of doing anything of the sort. I can say I like Focusrite though! When I upgraded my computer's interface from a shitty NI Audio Kontrol to a Focusrite Scarlett I heard a world of difference on the ins and outs.

All you really need is a class-compliant USB interface, but Sonic State has news that a not-so-class-complaint one is coming from Focusrite. They've tried to pack a lot of important features into the iTrack, including the ability to switch on headphone monitoring from the front panel. But while it has a unique "Device Link" connection for your iPad, it requires a separate USB connection dedicated to powering the unit.

This is not drawing power from the iPad. That's fair, the iPad is really stingy about how much power it will let a peripheral draw.

What's the point of this then? If you're going to need a dedicated power-supply, why not get a Focusrite Scarlett 8i6 and get a hell of a lot more I/O for $30 more? As a bonus you won't have to wait for the iTrack Solo to ship in October.

While your mind boggles on that, you could have your head bobbing to this very nice demo.

They've also posted a behind the scenes explaining the production process for the video.