The first time I encountered Jamstik, a guitar controller for Mac and iOS, was at CES 2013. Zivix — the team behind the product — came to our trailer and gave us a demo. That was a prototype, which eventually got crowdfunded and did pretty well as history tells it. Now there’s Jamstik+ with a few significant improvements, and once again, the company’s looking to you to fund it (spoiler: It’s already met its goal). While the original Jamstik won people over, concerns over latency left some users wanting. Has version 2.0 cracked it?