Borrowing its general shape from the earlier Loop stand, Griffin's new StudioConnect ($150) is the company's flagship audio accessory for iPads, combining a unique dock, MIDI and guitar connectors, and dual monitoring options into an attractive, streamlined product. Made from a mix of matte and glossy black plastics with a prominent chrome volume dial, StudioConnect features a 3.5mm headphone port on the front, enabling GarageBand and other music…