Firmware 2.8 and USB Audio Driver - Mac in Helix Posted July 31, 2019 1 minute ago, datacommando said: My Behringer U-Phoria UMC204HD, ProTools Aggregate Device and Soundflower all appear in the Audio/MIDI set up along with the System built in options and Helix, but only Helix requires a driver. Hmm, I don't know much about Apple Class Compliancy but Class Compliant idea is there is not installable driver. It is hanshaking driverless protocol. By "preclude" you mean CC usage option is no longer present in OSX? The new Core Audio driver decription suggest the driver is required for 2.80 firmware compatibility what not neccessary must be true.