Hi npt1988,
Unfortunatley, these aren't possible. The onboard sound is disabled when you use a PCI sound card, and the front audio jacks can only be used to connect speakers to the onboard audio. From what you are trying to do, it sounds like you would be best either using just the onboard sound or using the soundblaster and getting a 3.5 mm extension cable and y-splitter cable.
Unfortunatley, these aren't possible. The onboard sound is disabled when you use a PCI sound card, and the front audio jacks can only be used to connect speakers to the onboard audio. From what you are trying to do, it sounds like you would be best either using just the onboard sound or using the soundblaster and getting a 3.5 mm extension cable and y-splitter cable.