Mic works but not headphones.

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Hello, I'm using a RME Babyface(Studio) sound card, and the weirdest thing about it is that it uses my Rode Procaster mic, but not my Sennheiser HD 280 headphones for some reason, and they're both connected through the same RME Babyface(Studio) sound card. So, a fix for this would be if we could... Mic works but not headphones.