This ring mod unit provides exceptional value for money, giving you two ring mods for less than the price of what you would expect to pay for one. It provides two inputs (X and Y) and one output (the product of X multiplied by Y) for each ring mod circuit. For example, the classic use for this kind of circuit would be to input an audio signal to X and an LFO wave to Y, giving you an often metallic and mostly atonal product at the output. I would have like to have had some controls on here, maybe just an attenuator on each input since most LFOs don't have built in attenuation. However, I realise that this would have increased the price of the unit. The build quality is great, as you would expect from Doepfer. All in all, it's a no-frills, value for money and extremely useful module which I would recommend to anyone who, like me, has limited space and money for modules.