I don\'t use Sonar and don\'t know the DMX card. I can say the M-Audio products are generally very good. If you need super low latency the RME cards are generally viewed as the best if you\'re using ASIO drivers (maybe not with Sonar, but dunno). I know I plan to use the M-Audio DiO card because I like the idea of having optical output (something the 2496 lacks). It doesn\'t have an analog input however and that may be crucial for tracking purposes. I\'ll be using it for a standalone Giga rig so I\'ll just need analog and digital output.