Welcome,
I've got a problem with Mirillis Action! The program doesn't want to capture the in-game sounds using the ASUS card. There are some exceptions in games like Torchlight or Ace Combat: Assault Horizon. The program works well with the motherboard-integrated Realtek and the sound is great then. I record in stereo (I've connected the headphones directly to the front panel) with Realtek, with ASUS there was many configurations I've tried (I have a 5.1 sound speaker system to which I plug-in the headphones - I don't plug the headphones directly to the card). I tried 5.1, 192kHz; Stereo, 44.1kHz also, but it didn't work. I have the latest drivers installed. I'm using the trial version. Fraps doesn't want to record the sound with ASUS too. Action! records the microphone, which is plugged to ASUS, but no sound in-game.