Audio for me seems completely broken in El Capitan (since early betas). I was hoping for Apple to resolve the issues but seems like that's not going to happen. I spent hours on Google trying to find a solution with no luck although many people report similar issues. USB DAC works for a little bit then stops and the only way to get audio back is to restart (killing core audio does nothing). Also, changing the format in Midi Setup (i.e. 44100Hz to 48000Hz) also kills the audio and I have to restart. Digital Out makes horrible crackling and popping noises. It also makes my DAC constantly click. If no audio plays for a few minutes, the audio stops working and I have to turn off the DAC and turn it back on. The only remedy seems to be downgrading to Yosemite. Has anyone been able to resolve the audio issues in El Capitan? This is happening on MBP early '15. The fact it works fine in Yosemite, tells me the hardware is fine.