Hey!
Just saw this video a few days ago. Is this any of you guys who made it?
I thinks its pretty cool idea, hardwiring an Axoloti and a PO-12 together, using Axoloti to midi trigger the PO-12. To me it seems like the outputs form Axoloti is wired to the first of the three points below each trigger button on the PO-12.
But it would be really nice to see some still pictures and close up shots of it.
Check it out:
good idea, but why use the powerfull axoloti dsp when a simple arduino or teensy can do the job cheaper, smaller and efficiently...?
I think teenage engineering gears use standart pullup gpio, so you can connect directly trigger switch to microcontroller gpio's (same voltage! 3.3v I guess). If you really fear about your stuff or want to play with higher voltage (5v) you can trig the switches with small signal transistors, or photodiodes / optocoupler...
Yeah that would be great too actually 
But I am not so savy on the hardware side, so I really depend heavily on being able to see exactly what I have to do. Experimenting with transistors and diodes would be pure luck if i didnt toast anything cause i wouldnt be knowing what I was doing, hehe
ok if you want to do the same hack as this video, link the two ground of both circuit (continuity from batterie - of po12) , then check the common line on the po12 switches (continuity on multimeter) then connect the other sides of switches to gpio, then trig it from gpio out patches, have to test for pullup or pulldown work...