MPC - Choosing more than one audio input pair

I have an audio interface (Saffire Pro 40) with multiple inputs. Why can I only select a single audio input pair at a time in the MPC Software. I've tried holding down shift, command, control and option (alt) while selecting them in case that was the problem but it doesn't let me select more than one. I can use multiple combinations of output pairs, and my input pairs work fine with my other DAW (Reason 8). Why is this? Any way to fix it? It'd be nice to select my different from my MPC Studio on the fly without having to go back into the Preferences constantly.
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