"1. Can the EA Overdrive dac be controlled with Amarra or Pure Music when using the async USB input?"
Yes.
"2. Does the Overdrive require drivers with a Mac, or is it like the Pace Car in that you plug it in and it automatically shows up in Preferences>Sound>Output?"
It requires a driver be loaded. All of my Async USB interfaces need this.
"3. Is the Overdrive compatible with Mac's "aggregate device" function, so that the outputs of a software-based crossover can be sent to two different dacs simultaneously?"
I have heard of others using this with Off-Ramp 4 etc.., but I have not been successful when I tried it. I'm not that experienced with Mac.
Steve N.
Empirical Audio
Yes.
"2. Does the Overdrive require drivers with a Mac, or is it like the Pace Car in that you plug it in and it automatically shows up in Preferences>Sound>Output?"
It requires a driver be loaded. All of my Async USB interfaces need this.
"3. Is the Overdrive compatible with Mac's "aggregate device" function, so that the outputs of a software-based crossover can be sent to two different dacs simultaneously?"
I have heard of others using this with Off-Ramp 4 etc.., but I have not been successful when I tried it. I'm not that experienced with Mac.
Steve N.
Empirical Audio