In fact it's just using the Axoloti's midi out, but fun to add a visual part. Or to use Processing as XY-controller, etc. Processing uses the MidiBus library (install from Sketch -> Import Library... -> Add Library... -> 'The MidiBus')
A simple etch-a-sketch type implementation using 2 pots on the Axoloti, sent over midi cc, and receiving midi thru from Processing.
No, the problem with my Axoloti has nothing to do with Processing. It also did midi/out well until I used the loadbang object one time. Since then it always disconnects (after a while or going out the live mode) when there's midi/out in the patch, also without the loadbang object. Flash rescue didn't help.