Vermona quadroPOL is a four-channel polarizer module. It can attenuate any incoming signal, in-phase or out of phase. One of its most special features is the way each channel’s level control works. Instead of having one dedicated zero-point, it has a “dead zone” where the input signal will be completely suppressed. Thus, you will easily find the off-position, even without a center-click, while, at the same time you’ll be able to create extremely sensitive level increasings.