I have recently been messing with this, I know its not a guitar or an offset, but it is certainly a project.
An 8 string plank, with a sustainer system, that works with individual system for each string, including a graphic EQ pre amp to select harmonics of the driven string. It also has an external input so it can work like an FX device (Sort of ! and I need to add wet/dry). I am using buzzers instead of winding my own drivers. The single string pickups are made from relay coils (not my own idea Mark Guitierreze n youtube )
There is also a spinning wheel with a magnet on it underneath the strings to act as a mechanical sustainer.
A lot going on. You play it by switching the strings on an off and fine tuning EQ being sent to driven string. The way it is patchable together I can insert effects being sent to buzzers driving the strings (very wild). It is all a prototype, I am going to build a 16 string nice one now I have proof of concept, I want it be half folk instrument half modular synth vibe when I build the 'nice' one.
Check out these videos to get more idea what it is
https://www.youtube.com/watch?v=lgvu-S_xDEo
https://www.youtube.com/watch?v=T1lumLotX94&t=5s
[url="https://www.youtube.com/watch?v=lgvu-S_xDEo"][/url]
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I don't care how small they are. If anyone knows the player I'm referring to (apparently had some rep to them) let me know, name is long gone from my 🧠 mind