Vintage effect unit, the E-767 PMP (PROFESSIONAL MUSIC PRODUCTS) Exciter/Noise Reduction. It features two HEX/Harmonic Exciters and SNR/Stereo Noise Reduction. A harmonic exciter adds harmonic tones (overtones) to the original sound, making muffled sounds crisp. For example, a live recording of a band often sounds muddy because the instruments and microphones are positioned far apart to balance the sound. (Professional recordings use many microphones, recording from a distance of tens of centimeters from the instruments.) When the distance increases, the harmonic components of the instruments are attenuated. The low frequencies are not attenuated as much, resulting in a muffled sound. This effect unit can be used to add harmonic components and master the sound with a crispness. When used with instruments, the sound stands out, and the presence increases even at the same volume. The noise reduction also has a gentle filter characteristic, so breathing noise is not noticeable. Normally, the input is connected to "HEX IN" and the output to "SNR OUT". This unit supports line input, so microphones, etc., will not have enough gain. This unit had a switch malfunction, so maintenance was performed. The feel of the switch on/off is inconsistent depending on the switch. There are scratches on the switches, escutcheon, and case. There is discoloration on the resin parts. There was no crackling on each switch and knob. Although it is currently working, it is a very old piece of equipment, so please understand that it is sold as-is, with no returns. ○ Power consumption: 2W ○ External dimensions: 482(W) x 44(H) x 240(D) mm ○ Weight: 2.7kg ○ Accessories: None Thank you for viewing.