Improv with magnetic contact mic, box and objects

A little noise improvisation to show off one of the new magnetic piezo contact microphones i built.
Magnetic contact mics can not only be attached to ferro-magnetic objects (e.g. a fridge door), but also to non-magnetic objects like wood or plastic, as long as part of the object is thin enough to allow for enough magnetic attraction while it's sandwiched inbetween the magnetic contact mic and another magnet. Which is what i did here. On the inside of the woodden box there's three magnets, in corresponding position to the three magnets that are inside the contact mic.

The reason for the triangular shape is that i wanted to use three piezo discs in this mic, because having three piezos wired in parallel (as opposed to a single one) sounds better with most equipment like electric guitar gear. This is because wiring them in parallel decreases the very high impedance of piezos, bringing it closer to the impedance of electric guitars.
I arranged the piezos in a triangle because, well, it seemed like an obvious thing to do, and also it looks cool. There might be a few phase issues going on, but it still sounds pretty good.

The triangular arrangement of the magnets inside the contact mic is not ideal though, as i found out when i when i was done building it. This way they're not as powerful as if they were for example arranged in a line with alternating polarities. I need to read a bit about how magnetic fields work, it seems. Or just experiment a little more.

In a way, this is two improvisations at once. First, i recorded the physical "instrument", then i built a virtual effect chain and did a second recording of me twiddling the knobs of that chain.