Just a PSA for anyone using a Sound Blaster (I'm using the X7) — the device doesn't seem compatible with 10.11 currently. Getting lots of distortion on one reboot and a missing device on the other. I've tried to hack the 10.9 AppleUSBAudio.kext into the system and tried to make the Creative kexts compatible but both efforts have been unsuccessful. If you stumble upon the same or a similar issue, I'd appreciate connecting here.