This module contains an analog high-quality ring modulator and an 1x4 multiples. AC-coupled ring modulator, based around the AD633 multiplier IC. The original frequencies are suppressed and you can hear only the sum of the frequencies (X+Y) and the difference (X-Y). The ring modulator works very clean. If only one signal is connected you won?t hear anything at the output. That is not the case with most ring mods as often you hear a bleed thru. All modules by Analogue Systems come ready to use with five years warranty mounted in the by the customer preferred rack or cabinet. For a timely delivery please confirm your choice and configuration as customer or specialised dealer via email