The Norteño and Latin folk musicians use a lot of Hohner Corona II and III accordions, which are MM and MMM instruments, so if you select the "Alpine" set (U1) or the "D" Folk (33) you will be close, especially if you detune the Musette sound to make it "wetter", pages 35 and 45 in your manual. You can spend time in the set editor to create your own sound, but that will be a lot more work.