Not sure how active this thread is anymore, but I figured I give this a try. I have a SI-24 with a RPC-1 card that I'm trying to get working with Sonar 7. I have installed the 64 bit RPC drivers and everything seems to be fine there. I can even play back audio through the SI-24 once inside of Sonar. However the control surface is not operational. I installed the control surface driver that I used previously with Sonar 3 for the SI-24 in hopes that it would work, but so far no luck. Is there another driver I need to get things operational or am I just missing something. By the way I am running all this on Windows 7 Ultimate 64 bit, and have tried with both 32 and 64 bit versions of Sonar 7..... Please Help!