The Ringmodulator simply multiplies two incoming signals. This creates linear side-bands in the spectrum that can produce metallic sounding effects. Note that if one channel is silent the output will be silence too. This is because a multiplication with zero is always zero. The boost control allows you to boost the output signal (up to 18db) - because often the result is far more quiet than before. The Ringmodulator uses 2x oversampling to reduce aliasing effects.