The way I would do it is record your MPC through the Mackie interface as you would any keyboard/line level instrument.
Sample in Mono from the start, now each sound will only require 1 channel. Assign pads to individual outputs in the mixer screen. Out 1 -Bd, Out 2 -Sn, Out 3 -Bass etc. Plug 4 x 1/4" cables from the outputs of you MPC into your Mackie interface inputs 1-4. Set up some blank tracks in logic and assign them to record the corresponding inputs from the Mackie. If you want to you can use MIDI to sync the interface to the MPC so it will start the DAW wordclock when you press Play. You don't have to do this step, if not you just have to trim the start and align it to the grid manually afterwards. If you don't sync it just hit record in Logic and hit play on the MPC. Now you are recording each sound to its own track in Logic, to be mixed later. In my opinion generating and moving around files is boring and impedes workflow. Samplers are instruments and should be used as such.