The Tetanus Booster listed on reverb (I should probably start linking the actual listing so what I about to say is not confused with the other Tetanus Boosters that will be surfacing on reverb soon:
https://reverb.com/item/1788747-rma-tet ... -2016-rust) is an experimental prototype/concept exploration build.
I did build in a contact microphone, so if nothing is plugged into the input the unit IS a microphone... but that is not the reason it is not optimized for anything other than noise/experimental (this is JUST MY OPINION), I plant that label on it because I tend to err on the side of caution as opposed to risk angering or disappointing my customers.
The changes to the circuitry that make it less useful for guitar/strings is primarily the use of HUGE coupling (DC blocking) caps between sections. The issue is that if you hit it with a dynamic signal the time it takes the cap to charge back up after discharging due to the signal is long enough that it causes a big ripple in bias, driving the circuit into cut-off. So what you get, when you jamb the strings real hard is an absolute faceplant in terms of output volume. So, there's kind of an inverted volume spike that plays a bit like an auto-wah, but instead of bonking a filter it's turning you down. I want to be absolutely clear in the fact that this "feature" is both identified and understood and NOT standard across the model range, which is why I am not going to upload a demo until I have a standard model to A/B with. It is fun to hit with a drum machine though..
I also converted the output buffer stage to another gain stage to really blow things out, this is a mod that is not debilitating, but it's difficult to showcase on this particular unit due to the issue I've described above. I'll see if I can spit out a proper demo a little bit later today...