bit quantizer + overdrive + filter.
4 bit quatize modes available
Mode1 = normal mode
Mode2 = in this mode, quantize error appears at higher frequency
Mode3 = modify version of mode1
Mode4 = modify version of mode2
Quality = quantize quality
Bit Knob = bit depth value.
Drive Knob = drive amount.
HP = cutoff frequency of highpass
LP = cutoff frequency of lowpass.
Vol = output volume.