The MCC is used to configure the BeatStep as you need it to control (in your case) the Alesis SD16.
So, do you know what CC's is the Alesis expecting?
If no, try to find its MIDI Specification chart (maybe the user manual?) and see which CC's control what Alesis Parameter.
Then, use that information to configure the BeatStep's knobs with MCC, send that configuration to one of BeatStep's 16 memories.
Close the MCC app, connect the BeatStep to Alesis and if you used the correct CC's, each knob should be able to control an Alesis parameter.