It might seem like we've gone mixer mad around here, but with a huge music trade-show starting this week, it's no surprise there's a pile of new tech on offer. The StageScape M20d visual mixer from Line 6 being one such example. Of course, we have inputs (12 line / mic, four line-only, and two for USB/SD streaming) and outputs (four XLR monitors, two master) all strummed along by