Blue Microphones Spark Digital review: a solid iOS / USB mic for recording on the go

It was all the way back in January, when Blue Microphones made its CES announcements, that the Spark Digital first broke cover alongside two other mobile recording devices. Our interest was immediately piqued thanks to the mic's USB 2.0 and iOS connectivity, which allows it to support the iPad, iPhone and iPod touch via the 30-pin jack. After a grueling wait that lasted until just a few weeks...