so is the 1+2 a multi out plugin then as wel as a stereo out?
Yes. All the microtonic mappings you see in the map panel refer to the same plugin instance. The mappings are a way to extract the proper audio channels from the multiple channel output of the plugin. To apply different effect plugins to different drum sounds, you set up tracks with the 1+2, and 3+4 etc. mappings. Then you wrap each of these tracks with a group track assigned with the desired effect plugin. Also remember to select which output each drum sound will use in the microtonic editor.