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.