I've had this rack for over 25 years. I'll probably never get rid of it—as it has amazingly crisp distortion for playing metal. It's also very difficult to find one for sale.
The mAXE includes a noise gate, and exciter "(harmonic exciter or aural exciter), which is an audio signal processing technique used to enhance a signal by dynamic equalization, phase manipulation, harmonic synthesis of (usually) high frequency signals, and through the addition of subtle harmonic distortion."
It still works, but I'm in process of replacing the pots and input jacks. I'm also thinking about copying the circuit(s) into a stomp box. This one is made in the USA and has all of the original knobs.