Pioneer’s new A1 ($299, aka XW-SMA1-K) is part of the Japanese developer’s second round of standalone AirPlay speaker systems, and as its names suggest, the company is beginning to understand Apple accessory development. Last year’s Elite Music Tap X-SMC4-K was an overcomplicated mess of a speaker, with a high price tag, all but indecipherable controls, and a “kitchen sink” approach to features. A1 thankfully strips away…