I have a Xonar DX and recently got another one because it was exceptionally cheap (2nd hand $20 on craigslist). I modded the $20 one with some new capacitors and OP amp and now I'm trying to use both of them in my computer.
However, the Xonar DX audio center seems to be able to control only one of them. Even when I switch the active Playback device to the other card on Windows, the software settings do not affect that card. Although both cards are fine for playing music when I set them as the default playback device, the one that isn't controlled by the software has a noticeable lag with the display when watching movies.
I would really like to be able to use both since sometimes I might like to listen to the modded sound but other times the stock sound of the Xonar DX. However, this software problem forces me to shut down my computer and swap the cards physically before I can make the change. It also prevents me from doing any accurate A/B testing to see if i'm suffering from a placebo effect and whether or not the sound signature changed due to the modifications.
I know most people don't have two of the same sound cards plugged into their computer, but I'm open to any suggestions to solve the problem nonetheless. Thanks.