My problem now is that I want to capture full game volume but listen to something else on higher volume without affecting the capture. But if I lower the game volume in Windows Volume Mixer then it's not captured at full volume even with application audio capture.
Yup. I understand your pain. I have a similar issue with capturing one source while trying to view another. The source i capture must be full volume so if i for instance play a video at the same time, i have to hear both sources in full volume. If i "mute" the captured source, no sound is written in the resulting video. It would be great if there was a way to mute the captured source and hear everything else but also record in full volume in the final recorded video at the same time. I've tried all that on a laptop.