Outputs with MultiMix16 Firewire and computer

Is it possible to mix in quad straight out of the mixer using the ALT 3/4 outputs, or do I have to buy a separate sound card for that? At the moment I'm working with the MultiMix16 Firewire, and a pair of M1 Active Mk2's. Just bought another pair of the monitors and plugged in to ALT 3/4 but it doesn't give me the option within my sequencer to send anything to ALT 3/4. Am I doing something wrong or is this not possible with the mixer alone?
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