Rolling Loud cofounders Tariq Cherif, left, and Matt Zingler. “I tried to call some people close to him but couldn’t get through.” “It was very shocking, I was caught off guard,” added Rolling Loud’s co-founder, 31-year-old Matt Zingler. It’s a huge loss.” Rolling Loud, the 5-year-old Miami-based festival, came of age in the SoundCloud rap era, where acts like Lil …