... DSP chip. Input processing includes Gain, Mute, Noise gate, high-cut, low-cut, 8 parameter EQ, Phase, Delay and so on (PRO-480 ... without Hi-cut Low-cut And PEQ) Output processing includes crossover , 5 parameter EQ,Gain ... ,L-SHELVE We can choose the style of all High-cut , Low-cut filter and Distributor unit: Butterworth,Linkwitz-Riley,Bessel;Choice slope ...