Connect one end of the instrument cable to the “Output” jack marked “L/MONO” on the back of the MicroKorg.
Connect the other end of the instrument cable to the 1/4-inch to 3.5-mm adapter.
Connect the other end of the adapter to the “Microphone” or “Line-in” input jack on your computer. If you are using an external audio interface, connect the instrument cable directly to an input on the interface.
Open your favorite recording software and create a new track.
Change the MicroKorg to the first patch and practice the part a few times. Start the recording software and play your bass line. Use multiple takes if necessary until you are happy with the result.
Create a second track and choose a different patch. Start the recording software and record the new track along with the first one. Continue adding tracks until you are happy with the result.