HEX E828 Harmonic Exciter by PMP (Professional Music Products), a brand that existed in the 80s. Features FREQ and Q controls, allowing you to boost the harmonics of a desired frequency range. Perfect for creating sharp attack sounds and glossy tones. It has a mysteriously cool metal body, but it's not an effect that drastically changes the sound. Instead, it seems to be used to subtly adjust the sound's resonance. Depending on the FREQ and Q settings, it can self-oscillate like an oscillator, making it suitable for experimental music and noise-based projects. It may also be useful for those who want to use enhancers and exciters to manipulate sounds analog-style in their DTM work, creating original sounds. Operation has been confirmed with no crackling or noise. The condition is quite clean. I am also listing other vintage effects and analog synthesizers. #exciter #effector #enhancer #guitar