Hi Jeff,
let me answer your questions:
1) Yes, the USB-6009 is capable of reading from and writing to channels at the same time
2) The total maximum sampling rate for the USB-6009 is 48 kS/s (multiplexed). That means using all 12 input channels you'll get 4KS/s per channel
3) Not really, but MAX is part of the DAQmx instalation package. NI-MAX is the Measurement and Automation Explorer, an application that allows you to configure your hardware devices and interfaces, set user scales etc. NI-DAQmx is our powerful driver software, that extends the capabilities of the tradional DAQ driver.
Please also see following links:
USB-6009,
DAQmxHave a good one,
Bernd