Instruments with non-standard tunings.
This body is maple plywood over a hollow pine core, double-bound. It came out very lightweight, too light to balance even a guitar neck. This was originally going to be the 12-string, but I realized that it would never balance. So I shuffled parts and bodies between some other projects - a planned six-string got canceled and became the twelver. That left this body free. I thought about it a while and decided it would make a good mandolin.
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My verdict on active tone controls for a guitar is that they are not worth it. There is already plenty of treble, and not enough bass that boosting it will make much difference. If you want to try an active control on a guitar, try an onboard distortion instead.
But the Artec EXP tone control is a funny thing. In the middle, it gives a flat clean boost. Turn it forward, and you get a high/low boost, or what amounts to a mid-scoop. Turn it back, and it gives a mid-boost. Sounds interesting, so I decided to try one.
More: Artec EXP Active Tone Control ...