1.1b1 in 10.5.1 with 1820m. Sound works and I can use logic. Something is amiss with the gain/volume though. Like I barely have my headphone output above 0 and it's very loud and quite distorted. If I pull the volume slider down to almost nothing in the menu bar, I can turn up the headphone knob to about where I normally have it in windows with EMU driver. It however sounds very lofi like cheap converters, thin, tinny, harsh with no depth or bass. It kinda sound like when you play 8 bit samples though a 16bit sound card. Tinny and aliased. Or maybe pushing a 24bit stream though a 16bit hole, like bit's are being truncated somewhere. That would explain the huge volume increase and distortion..... but I'm just guessing.