The tiny, 80 Euro, 8-bit Kastle synth from Bastl just got better. A 1.5 revision updates the case, sound, and features. First off, in addition to batteries, you can now run on micro USB power. The case is updated, too. It’s fiberglass instead of acrylic for added durability, and has a slick black matte finish, plus better patch points. And then there’s sound. Bastl Instruments say they’ve done a total rework on the sound engine, improving smoothness, ranges, and anti-aliasing performance.