Micro Book

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The MicroBook from MOTU aims to bring professional level studio recording capabilities to a Mac or PC computer. The bus-powered USB interface offers users up to four simultaneous inputs as well as a host of studio mixing tools and audio analyzers. It uses industry standard Mac and PC drivers to ensure maximum software compatibility and is small and light enough to fit in a pocket.

Despite its compact size, the MicroBook audio interface packs in some mighty studio quality recording tools for musicians on-the-go or would-be engineers. It can record up to four inputs simultaneously from dedicated guitar and mic sockets at the front and a couple of line-in sockets to the rear. Audio is output via balanced TRS quarter-inch main outs, stereo "mini" line out, S/PDIF digital out, and phones.

Further Reading:
http://www.gizmag.com/microbook-personal-bus-powered-usb-recording-studio/15596/