I am trying to setup the Pandora radios to play out of different sound cards on my computer. I select the Pandora app, then select the radio (#1) and then the output device. I then go to the next radio (#2) and select a different output device. I then select close and then go into Pandora on the web client and select radio #1 and then play. Sound comes out of whatever the last output device that I setup. So if it was #2 the sound comes out that of that output device for both radios that I setup. If I select radio #1 from the myServer app then the station stops playing, and if I select play again the sound comes out of that output device.
I didn't have this problem with the myMusic app, I was able to select different output devices for each radio output.