/* ========================================
 *  SmoothEQ2 - SmoothEQ2.h
 *  Copyright (c) airwindows, Airwindows uses the MIT license
 * ======================================== */

#ifndef __SmoothEQ2_H
#include "SmoothEQ2.h"
#endif

void SmoothEQ2::processReplacing(float **inputs, float **outputs, VstInt32 sampleFrames) 
{
    float* in1  =  inputs[0];
    float* in2  =  inputs[1];
    float* out1 = outputs[0];
    float* out2 = outputs[1];
	
	double trebleGain = (A-0.5)*2.0;
	trebleGain = 1.0+(trebleGain*fabs(trebleGain)*fabs(trebleGain));
	double highmidGain = (B-0.5)*2.0;
	highmidGain = 1.0+(highmidGain*fabs(highmidGain)*fabs(highmidGain));
	double lowmidGain = (C-0.5)*2.0;
	lowmidGain = 1.0+(lowmidGain*fabs(lowmidGain)*fabs(lowmidGain));
	double bassGain = (D-0.5)*2.0;
	bassGain = 1.0+(bassGain*fabs(bassGain)*fabs(bassGain));
	
	double trebleRef = E-0.5;
	double highmidRef = F-0.5;
	double lowmidRef = G-0.5;
	double bassRef = H-0.5;
	double highF = 0.75 + ((trebleRef+trebleRef+trebleRef+highmidRef)*0.125);
	double bassF = 0.25 + ((lowmidRef+bassRef+bassRef+bassRef)*0.125);
	double midF = (highF*0.5) + (bassF*0.5) + ((highmidRef+lowmidRef)*0.125);
	
	double highQ = fmax(fmin(1.0+(highmidRef-trebleRef),4.0),0.125);
	double midQ = fmax(fmin(1.0+(lowmidRef-highmidRef),4.0),0.125);
	double lowQ = fmax(fmin(1.0+(bassRef-lowmidRef),4.0),0.125);
	
	highA[biq_freq] = ((pow(highF,3)*20000.0)/getSampleRate());
	highC[biq_freq] = highB[biq_freq] = highA[biq_freq] = fmax(fmin(highA[biq_freq],0.4999),0.00025);
	double highFreq = pow(highF,3)*20000.0;
	double omega = 2.0*M_PI*(highFreq/getSampleRate());
	double K = 2.0-cos(omega);
	double highCoef = -sqrt((K*K)-1.0)+K;
	highA[biq_reso] = 2.24697960 * highQ;
	highB[biq_reso] = 0.80193774 * highQ;
	highC[biq_reso] = 0.55495813 * highQ;
	
	midA[biq_freq] = ((pow(midF,3)*20000.0)/getSampleRate());
	midC[biq_freq] = midB[biq_freq] = midA[biq_freq] = fmax(fmin(midA[biq_freq],0.4999),0.00025);	
	double midFreq = pow(midF,3)*20000.0;
	omega = 2.0*M_PI*(midFreq/getSampleRate());
	K = 2.0-cos(omega);
	double midCoef = -sqrt((K*K)-1.0)+K;
	midA[biq_reso] = 2.24697960 * midQ;
	midB[biq_reso] = 0.80193774 * midQ;
	midC[biq_reso] = 0.55495813 * midQ;
	
	lowA[biq_freq] = ((pow(bassF,3)*20000.0)/getSampleRate());
	lowC[biq_freq] = lowB[biq_freq] = lowA[biq_freq] = fmax(fmin(lowA[biq_freq],0.4999),0.00025);
	double lowFreq = pow(bassF,3)*20000.0;
	omega = 2.0*M_PI*(lowFreq/getSampleRate());
	K = 2.0-cos(omega);
	double lowCoef = -sqrt((K*K)-1.0)+K;
	lowA[biq_reso] = 2.24697960 * lowQ;
	lowB[biq_reso] = 0.80193774 * lowQ;
	lowC[biq_reso] = 0.55495813 * lowQ;
	
	K = tan(M_PI * highA[biq_freq]);
	double norm = 1.0 / (1.0 + K / highA[biq_reso] + K * K);
	highA[biq_a0] = K * K * norm;
	highA[biq_a1] = 2.0 * highA[biq_a0];
	highA[biq_a2] = highA[biq_a0];
	highA[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	highA[biq_b2] = (1.0 - K / highA[biq_reso] + K * K) * norm;
	K = tan(M_PI * highB[biq_freq]);
	norm = 1.0 / (1.0 + K / highB[biq_reso] + K * K);
	highB[biq_a0] = K * K * norm;
	highB[biq_a1] = 2.0 * highB[biq_a0];
	highB[biq_a2] = highB[biq_a0];
	highB[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	highB[biq_b2] = (1.0 - K / highB[biq_reso] + K * K) * norm;
	K = tan(M_PI * highC[biq_freq]);
	norm = 1.0 / (1.0 + K / highC[biq_reso] + K * K);
	highC[biq_a0] = K * K * norm;
	highC[biq_a1] = 2.0 * highC[biq_a0];
	highC[biq_a2] = highC[biq_a0];
	highC[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	highC[biq_b2] = (1.0 - K / highC[biq_reso] + K * K) * norm;
	
	K = tan(M_PI * midA[biq_freq]);
	norm = 1.0 / (1.0 + K / midA[biq_reso] + K * K);
	midA[biq_a0] = K * K * norm;
	midA[biq_a1] = 2.0 * midA[biq_a0];
	midA[biq_a2] = midA[biq_a0];
	midA[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	midA[biq_b2] = (1.0 - K / midA[biq_reso] + K * K) * norm;
	K = tan(M_PI * midB[biq_freq]);
	norm = 1.0 / (1.0 + K / midB[biq_reso] + K * K);
	midB[biq_a0] = K * K * norm;
	midB[biq_a1] = 2.0 * midB[biq_a0];
	midB[biq_a2] = midB[biq_a0];
	midB[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	midB[biq_b2] = (1.0 - K / midB[biq_reso] + K * K) * norm;
	K = tan(M_PI * midC[biq_freq]);
	norm = 1.0 / (1.0 + K / midC[biq_reso] + K * K);
	midC[biq_a0] = K * K * norm;
	midC[biq_a1] = 2.0 * midC[biq_a0];
	midC[biq_a2] = midC[biq_a0];
	midC[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	midC[biq_b2] = (1.0 - K / midC[biq_reso] + K * K) * norm;
	
	K = tan(M_PI * lowA[biq_freq]);
	norm = 1.0 / (1.0 + K / lowA[biq_reso] + K * K);
	lowA[biq_a0] = K * K * norm;
	lowA[biq_a1] = 2.0 * lowA[biq_a0];
	lowA[biq_a2] = lowA[biq_a0];
	lowA[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	lowA[biq_b2] = (1.0 - K / lowA[biq_reso] + K * K) * norm;
	K = tan(M_PI * lowB[biq_freq]);
	norm = 1.0 / (1.0 + K / lowB[biq_reso] + K * K);
	lowB[biq_a0] = K * K * norm;
	lowB[biq_a1] = 2.0 * lowB[biq_a0];
	lowB[biq_a2] = lowB[biq_a0];
	lowB[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	lowB[biq_b2] = (1.0 - K / lowB[biq_reso] + K * K) * norm;
	K = tan(M_PI * lowC[biq_freq]);
	norm = 1.0 / (1.0 + K / lowC[biq_reso] + K * K);
	lowC[biq_a0] = K * K * norm;
	lowC[biq_a1] = 2.0 * lowC[biq_a0];
	lowC[biq_a2] = lowC[biq_a0];
	lowC[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	lowC[biq_b2] = (1.0 - K / lowC[biq_reso] + K * K) * norm;
	
    while (--sampleFrames >= 0)
    {
		double inputSampleL = *in1;
		double inputSampleR = *in2;
		if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
		if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
		
		double trebleL = inputSampleL;		
		double outSample = (trebleL * highA[biq_a0]) + highA[biq_sL1];
		highA[biq_sL1] = (trebleL * highA[biq_a1]) - (outSample * highA[biq_b1]) + highA[biq_sL2];
		highA[biq_sL2] = (trebleL * highA[biq_a2]) - (outSample * highA[biq_b2]);
		double highmidL = outSample; trebleL -= highmidL;
		
		outSample = (highmidL * midA[biq_a0]) + midA[biq_sL1];
		midA[biq_sL1] = (highmidL * midA[biq_a1]) - (outSample * midA[biq_b1]) + midA[biq_sL2];
		midA[biq_sL2] = (highmidL * midA[biq_a2]) - (outSample * midA[biq_b2]);
		double lowmidL = outSample; highmidL -= lowmidL;
		
		outSample = (lowmidL * lowA[biq_a0]) + lowA[biq_sL1];
		lowA[biq_sL1] = (lowmidL * lowA[biq_a1]) - (outSample * lowA[biq_b1]) + lowA[biq_sL2];
		lowA[biq_sL2] = (lowmidL * lowA[biq_a2]) - (outSample * lowA[biq_b2]);
		double bassL = outSample; lowmidL -= bassL;
		
		trebleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
		//first stage of three crossovers
		
		outSample = (trebleL * highB[biq_a0]) + highB[biq_sL1];
		highB[biq_sL1] = (trebleL * highB[biq_a1]) - (outSample * highB[biq_b1]) + highB[biq_sL2];
		highB[biq_sL2] = (trebleL * highB[biq_a2]) - (outSample * highB[biq_b2]);
		highmidL = outSample; trebleL -= highmidL;
		
		outSample = (highmidL * midB[biq_a0]) + midB[biq_sL1];
		midB[biq_sL1] = (highmidL * midB[biq_a1]) - (outSample * midB[biq_b1]) + midB[biq_sL2];
		midB[biq_sL2] = (highmidL * midB[biq_a2]) - (outSample * midB[biq_b2]);
		lowmidL = outSample; highmidL -= lowmidL;
		
		outSample = (lowmidL * lowB[biq_a0]) + lowB[biq_sL1];
		lowB[biq_sL1] = (lowmidL * lowB[biq_a1]) - (outSample * lowB[biq_b1]) + lowB[biq_sL2];
		lowB[biq_sL2] = (lowmidL * lowB[biq_a2]) - (outSample * lowB[biq_b2]);
		bassL = outSample; lowmidL -= bassL;
		
		trebleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
		//second stage of three crossovers
		
		outSample = (trebleL * highC[biq_a0]) + highC[biq_sL1];
		highC[biq_sL1] = (trebleL * highC[biq_a1]) - (outSample * highC[biq_b1]) + highC[biq_sL2];
		highC[biq_sL2] = (trebleL * highC[biq_a2]) - (outSample * highC[biq_b2]);
		highmidL = outSample; trebleL -= highmidL;
		
		outSample = (highmidL * midC[biq_a0]) + midC[biq_sL1];
		midC[biq_sL1] = (highmidL * midC[biq_a1]) - (outSample * midC[biq_b1]) + midC[biq_sL2];
		midC[biq_sL2] = (highmidL * midC[biq_a2]) - (outSample * midC[biq_b2]);
		lowmidL = outSample; highmidL -= lowmidL;
		
		outSample = (lowmidL * lowC[biq_a0]) + lowC[biq_sL1];
		lowC[biq_sL1] = (lowmidL * lowC[biq_a1]) - (outSample * lowC[biq_b1]) + lowC[biq_sL2];
		lowC[biq_sL2] = (lowmidL * lowC[biq_a2]) - (outSample * lowC[biq_b2]);
		bassL = outSample; lowmidL -= bassL;
		
		trebleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
		//third stage of three crossovers
		
		highLIIR = (highLIIR*highCoef) + (trebleL*(1.0-highCoef));
		highmidL = highLIIR; trebleL -= highmidL;
		
		midLIIR = (midLIIR*midCoef) + (highmidL*(1.0-midCoef));
		lowmidL = midLIIR; highmidL -= lowmidL;
		
		lowLIIR = (lowLIIR*lowCoef) + (lowmidL*(1.0-lowCoef));
		bassL = lowLIIR; lowmidL -= bassL;
		
		inputSampleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);		
		//fourth stage of three crossovers is the exponential filters
		
		
		double trebleR = inputSampleR;		
		outSample = (trebleR * highA[biq_a0]) + highA[biq_sR1];
		highA[biq_sR1] = (trebleR * highA[biq_a1]) - (outSample * highA[biq_b1]) + highA[biq_sR2];
		highA[biq_sR2] = (trebleR * highA[biq_a2]) - (outSample * highA[biq_b2]);
		double highmidR = outSample; trebleR -= highmidR;
		
		outSample = (highmidR * midA[biq_a0]) + midA[biq_sR1];
		midA[biq_sR1] = (highmidR * midA[biq_a1]) - (outSample * midA[biq_b1]) + midA[biq_sR2];
		midA[biq_sR2] = (highmidR * midA[biq_a2]) - (outSample * midA[biq_b2]);
		double lowmidR = outSample; highmidR -= lowmidR;
		
		outSample = (lowmidR * lowA[biq_a0]) + lowA[biq_sR1];
		lowA[biq_sR1] = (lowmidR * lowA[biq_a1]) - (outSample * lowA[biq_b1]) + lowA[biq_sR2];
		lowA[biq_sR2] = (lowmidR * lowA[biq_a2]) - (outSample * lowA[biq_b2]);
		double bassR = outSample; lowmidR -= bassR;
		
		trebleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
		//first stage of three crossovers
		
		outSample = (trebleR * highB[biq_a0]) + highB[biq_sR1];
		highB[biq_sR1] = (trebleR * highB[biq_a1]) - (outSample * highB[biq_b1]) + highB[biq_sR2];
		highB[biq_sR2] = (trebleR * highB[biq_a2]) - (outSample * highB[biq_b2]);
		highmidR = outSample; trebleR -= highmidR;
		
		outSample = (highmidR * midB[biq_a0]) + midB[biq_sR1];
		midB[biq_sR1] = (highmidR * midB[biq_a1]) - (outSample * midB[biq_b1]) + midB[biq_sR2];
		midB[biq_sR2] = (highmidR * midB[biq_a2]) - (outSample * midB[biq_b2]);
		lowmidR = outSample; highmidR -= lowmidR;
		
		outSample = (lowmidR * lowB[biq_a0]) + lowB[biq_sR1];
		lowB[biq_sR1] = (lowmidR * lowB[biq_a1]) - (outSample * lowB[biq_b1]) + lowB[biq_sR2];
		lowB[biq_sR2] = (lowmidR * lowB[biq_a2]) - (outSample * lowB[biq_b2]);
		bassR = outSample; lowmidR -= bassR;
		
		trebleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
		//second stage of three crossovers
		
		outSample = (trebleR * highC[biq_a0]) + highC[biq_sR1];
		highC[biq_sR1] = (trebleR * highC[biq_a1]) - (outSample * highC[biq_b1]) + highC[biq_sR2];
		highC[biq_sR2] = (trebleR * highC[biq_a2]) - (outSample * highC[biq_b2]);
		highmidR = outSample; trebleR -= highmidR;
		
		outSample = (highmidR * midC[biq_a0]) + midC[biq_sR1];
		midC[biq_sR1] = (highmidR * midC[biq_a1]) - (outSample * midC[biq_b1]) + midC[biq_sR2];
		midC[biq_sR2] = (highmidR * midC[biq_a2]) - (outSample * midC[biq_b2]);
		lowmidR = outSample; highmidR -= lowmidR;
		
		outSample = (lowmidR * lowC[biq_a0]) + lowC[biq_sR1];
		lowC[biq_sR1] = (lowmidR * lowC[biq_a1]) - (outSample * lowC[biq_b1]) + lowC[biq_sR2];
		lowC[biq_sR2] = (lowmidR * lowC[biq_a2]) - (outSample * lowC[biq_b2]);
		bassR = outSample; lowmidR -= bassR;
		
		trebleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
		//third stage of three crossovers
		
		highRIIR = (highRIIR*highCoef) + (trebleR*(1.0-highCoef));
		highmidR = highRIIR; trebleR -= highmidR;
		
		midRIIR = (midRIIR*midCoef) + (highmidR*(1.0-midCoef));
		lowmidR = midRIIR; highmidR -= lowmidR;
		
		lowRIIR = (lowRIIR*lowCoef) + (lowmidR*(1.0-lowCoef));
		bassR = lowRIIR; lowmidR -= bassR;
		
		inputSampleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);		
		//fourth stage of three crossovers is the exponential filters
		
		//begin 32 bit stereo floating point dither
		int expon; frexpf((float)inputSampleL, &expon);
		fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
		inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		frexpf((float)inputSampleR, &expon);
		fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
		inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 5.5e-36l * pow(2,expon+62));
		//end 32 bit stereo floating point dither
		
		*out1 = inputSampleL;
		*out2 = inputSampleR;

		in1++;
		in2++;
		out1++;
		out2++;
    }
}

void SmoothEQ2::processDoubleReplacing(double **inputs, double **outputs, VstInt32 sampleFrames) 
{
    double* in1  =  inputs[0];
    double* in2  =  inputs[1];
    double* out1 = outputs[0];
    double* out2 = outputs[1];
	
	double trebleGain = (A-0.5)*2.0;
	trebleGain = 1.0+(trebleGain*fabs(trebleGain)*fabs(trebleGain));
	double highmidGain = (B-0.5)*2.0;
	highmidGain = 1.0+(highmidGain*fabs(highmidGain)*fabs(highmidGain));
	double lowmidGain = (C-0.5)*2.0;
	lowmidGain = 1.0+(lowmidGain*fabs(lowmidGain)*fabs(lowmidGain));
	double bassGain = (D-0.5)*2.0;
	bassGain = 1.0+(bassGain*fabs(bassGain)*fabs(bassGain));
	
	double trebleRef = E-0.5;
	double highmidRef = F-0.5;
	double lowmidRef = G-0.5;
	double bassRef = H-0.5;
	double highF = 0.75 + ((trebleRef+trebleRef+trebleRef+highmidRef)*0.125);
	double bassF = 0.25 + ((lowmidRef+bassRef+bassRef+bassRef)*0.125);
	double midF = (highF*0.5) + (bassF*0.5) + ((highmidRef+lowmidRef)*0.125);
	
	double highQ = fmax(fmin(1.0+(highmidRef-trebleRef),4.0),0.125);
	double midQ = fmax(fmin(1.0+(lowmidRef-highmidRef),4.0),0.125);
	double lowQ = fmax(fmin(1.0+(bassRef-lowmidRef),4.0),0.125);
	
	highA[biq_freq] = ((pow(highF,3)*20000.0)/getSampleRate());
	highC[biq_freq] = highB[biq_freq] = highA[biq_freq] = fmax(fmin(highA[biq_freq],0.4999),0.00025);
	double highFreq = pow(highF,3)*20000.0;
	double omega = 2.0*M_PI*(highFreq/getSampleRate());
	double K = 2.0-cos(omega);
	double highCoef = -sqrt((K*K)-1.0)+K;
	highA[biq_reso] = 2.24697960 * highQ;
	highB[biq_reso] = 0.80193774 * highQ;
	highC[biq_reso] = 0.55495813 * highQ;
	
	midA[biq_freq] = ((pow(midF,3)*20000.0)/getSampleRate());
	midC[biq_freq] = midB[biq_freq] = midA[biq_freq] = fmax(fmin(midA[biq_freq],0.4999),0.00025);	
	double midFreq = pow(midF,3)*20000.0;
	omega = 2.0*M_PI*(midFreq/getSampleRate());
	K = 2.0-cos(omega);
	double midCoef = -sqrt((K*K)-1.0)+K;
	midA[biq_reso] = 2.24697960 * midQ;
	midB[biq_reso] = 0.80193774 * midQ;
	midC[biq_reso] = 0.55495813 * midQ;
	
	lowA[biq_freq] = ((pow(bassF,3)*20000.0)/getSampleRate());
	lowC[biq_freq] = lowB[biq_freq] = lowA[biq_freq] = fmax(fmin(lowA[biq_freq],0.4999),0.00025);
	double lowFreq = pow(bassF,3)*20000.0;
	omega = 2.0*M_PI*(lowFreq/getSampleRate());
	K = 2.0-cos(omega);
	double lowCoef = -sqrt((K*K)-1.0)+K;
	lowA[biq_reso] = 2.24697960 * lowQ;
	lowB[biq_reso] = 0.80193774 * lowQ;
	lowC[biq_reso] = 0.55495813 * lowQ;
	
	K = tan(M_PI * highA[biq_freq]);
	double norm = 1.0 / (1.0 + K / highA[biq_reso] + K * K);
	highA[biq_a0] = K * K * norm;
	highA[biq_a1] = 2.0 * highA[biq_a0];
	highA[biq_a2] = highA[biq_a0];
	highA[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	highA[biq_b2] = (1.0 - K / highA[biq_reso] + K * K) * norm;
	K = tan(M_PI * highB[biq_freq]);
	norm = 1.0 / (1.0 + K / highB[biq_reso] + K * K);
	highB[biq_a0] = K * K * norm;
	highB[biq_a1] = 2.0 * highB[biq_a0];
	highB[biq_a2] = highB[biq_a0];
	highB[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	highB[biq_b2] = (1.0 - K / highB[biq_reso] + K * K) * norm;
	K = tan(M_PI * highC[biq_freq]);
	norm = 1.0 / (1.0 + K / highC[biq_reso] + K * K);
	highC[biq_a0] = K * K * norm;
	highC[biq_a1] = 2.0 * highC[biq_a0];
	highC[biq_a2] = highC[biq_a0];
	highC[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	highC[biq_b2] = (1.0 - K / highC[biq_reso] + K * K) * norm;
	
	K = tan(M_PI * midA[biq_freq]);
	norm = 1.0 / (1.0 + K / midA[biq_reso] + K * K);
	midA[biq_a0] = K * K * norm;
	midA[biq_a1] = 2.0 * midA[biq_a0];
	midA[biq_a2] = midA[biq_a0];
	midA[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	midA[biq_b2] = (1.0 - K / midA[biq_reso] + K * K) * norm;
	K = tan(M_PI * midB[biq_freq]);
	norm = 1.0 / (1.0 + K / midB[biq_reso] + K * K);
	midB[biq_a0] = K * K * norm;
	midB[biq_a1] = 2.0 * midB[biq_a0];
	midB[biq_a2] = midB[biq_a0];
	midB[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	midB[biq_b2] = (1.0 - K / midB[biq_reso] + K * K) * norm;
	K = tan(M_PI * midC[biq_freq]);
	norm = 1.0 / (1.0 + K / midC[biq_reso] + K * K);
	midC[biq_a0] = K * K * norm;
	midC[biq_a1] = 2.0 * midC[biq_a0];
	midC[biq_a2] = midC[biq_a0];
	midC[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	midC[biq_b2] = (1.0 - K / midC[biq_reso] + K * K) * norm;
	
	K = tan(M_PI * lowA[biq_freq]);
	norm = 1.0 / (1.0 + K / lowA[biq_reso] + K * K);
	lowA[biq_a0] = K * K * norm;
	lowA[biq_a1] = 2.0 * lowA[biq_a0];
	lowA[biq_a2] = lowA[biq_a0];
	lowA[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	lowA[biq_b2] = (1.0 - K / lowA[biq_reso] + K * K) * norm;
	K = tan(M_PI * lowB[biq_freq]);
	norm = 1.0 / (1.0 + K / lowB[biq_reso] + K * K);
	lowB[biq_a0] = K * K * norm;
	lowB[biq_a1] = 2.0 * lowB[biq_a0];
	lowB[biq_a2] = lowB[biq_a0];
	lowB[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	lowB[biq_b2] = (1.0 - K / lowB[biq_reso] + K * K) * norm;
	K = tan(M_PI * lowC[biq_freq]);
	norm = 1.0 / (1.0 + K / lowC[biq_reso] + K * K);
	lowC[biq_a0] = K * K * norm;
	lowC[biq_a1] = 2.0 * lowC[biq_a0];
	lowC[biq_a2] = lowC[biq_a0];
	lowC[biq_b1] = 2.0 * (K * K - 1.0) * norm;
	lowC[biq_b2] = (1.0 - K / lowC[biq_reso] + K * K) * norm;
	
    while (--sampleFrames >= 0)
    {
		double inputSampleL = *in1;
		double inputSampleR = *in2;
		if (fabs(inputSampleL)<1.18e-23) inputSampleL = fpdL * 1.18e-17;
		if (fabs(inputSampleR)<1.18e-23) inputSampleR = fpdR * 1.18e-17;
		
		double trebleL = inputSampleL;		
		double outSample = (trebleL * highA[biq_a0]) + highA[biq_sL1];
		highA[biq_sL1] = (trebleL * highA[biq_a1]) - (outSample * highA[biq_b1]) + highA[biq_sL2];
		highA[biq_sL2] = (trebleL * highA[biq_a2]) - (outSample * highA[biq_b2]);
		double highmidL = outSample; trebleL -= highmidL;
		
		outSample = (highmidL * midA[biq_a0]) + midA[biq_sL1];
		midA[biq_sL1] = (highmidL * midA[biq_a1]) - (outSample * midA[biq_b1]) + midA[biq_sL2];
		midA[biq_sL2] = (highmidL * midA[biq_a2]) - (outSample * midA[biq_b2]);
		double lowmidL = outSample; highmidL -= lowmidL;
		
		outSample = (lowmidL * lowA[biq_a0]) + lowA[biq_sL1];
		lowA[biq_sL1] = (lowmidL * lowA[biq_a1]) - (outSample * lowA[biq_b1]) + lowA[biq_sL2];
		lowA[biq_sL2] = (lowmidL * lowA[biq_a2]) - (outSample * lowA[biq_b2]);
		double bassL = outSample; lowmidL -= bassL;
		
		trebleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
		//first stage of three crossovers
		
		outSample = (trebleL * highB[biq_a0]) + highB[biq_sL1];
		highB[biq_sL1] = (trebleL * highB[biq_a1]) - (outSample * highB[biq_b1]) + highB[biq_sL2];
		highB[biq_sL2] = (trebleL * highB[biq_a2]) - (outSample * highB[biq_b2]);
		highmidL = outSample; trebleL -= highmidL;
		
		outSample = (highmidL * midB[biq_a0]) + midB[biq_sL1];
		midB[biq_sL1] = (highmidL * midB[biq_a1]) - (outSample * midB[biq_b1]) + midB[biq_sL2];
		midB[biq_sL2] = (highmidL * midB[biq_a2]) - (outSample * midB[biq_b2]);
		lowmidL = outSample; highmidL -= lowmidL;
		
		outSample = (lowmidL * lowB[biq_a0]) + lowB[biq_sL1];
		lowB[biq_sL1] = (lowmidL * lowB[biq_a1]) - (outSample * lowB[biq_b1]) + lowB[biq_sL2];
		lowB[biq_sL2] = (lowmidL * lowB[biq_a2]) - (outSample * lowB[biq_b2]);
		bassL = outSample; lowmidL -= bassL;
		
		trebleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
		//second stage of three crossovers
		
		outSample = (trebleL * highC[biq_a0]) + highC[biq_sL1];
		highC[biq_sL1] = (trebleL * highC[biq_a1]) - (outSample * highC[biq_b1]) + highC[biq_sL2];
		highC[biq_sL2] = (trebleL * highC[biq_a2]) - (outSample * highC[biq_b2]);
		highmidL = outSample; trebleL -= highmidL;
		
		outSample = (highmidL * midC[biq_a0]) + midC[biq_sL1];
		midC[biq_sL1] = (highmidL * midC[biq_a1]) - (outSample * midC[biq_b1]) + midC[biq_sL2];
		midC[biq_sL2] = (highmidL * midC[biq_a2]) - (outSample * midC[biq_b2]);
		lowmidL = outSample; highmidL -= lowmidL;
		
		outSample = (lowmidL * lowC[biq_a0]) + lowC[biq_sL1];
		lowC[biq_sL1] = (lowmidL * lowC[biq_a1]) - (outSample * lowC[biq_b1]) + lowC[biq_sL2];
		lowC[biq_sL2] = (lowmidL * lowC[biq_a2]) - (outSample * lowC[biq_b2]);
		bassL = outSample; lowmidL -= bassL;
		
		trebleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);
		//third stage of three crossovers
		
		highLIIR = (highLIIR*highCoef) + (trebleL*(1.0-highCoef));
		highmidL = highLIIR; trebleL -= highmidL;
		
		midLIIR = (midLIIR*midCoef) + (highmidL*(1.0-midCoef));
		lowmidL = midLIIR; highmidL -= lowmidL;
		
		lowLIIR = (lowLIIR*lowCoef) + (lowmidL*(1.0-lowCoef));
		bassL = lowLIIR; lowmidL -= bassL;
		
		inputSampleL = (bassL*bassGain) + (lowmidL*lowmidGain) + (highmidL*highmidGain) + (trebleL*trebleGain);		
		//fourth stage of three crossovers is the exponential filters
		
		
		double trebleR = inputSampleR;		
		outSample = (trebleR * highA[biq_a0]) + highA[biq_sR1];
		highA[biq_sR1] = (trebleR * highA[biq_a1]) - (outSample * highA[biq_b1]) + highA[biq_sR2];
		highA[biq_sR2] = (trebleR * highA[biq_a2]) - (outSample * highA[biq_b2]);
		double highmidR = outSample; trebleR -= highmidR;
		
		outSample = (highmidR * midA[biq_a0]) + midA[biq_sR1];
		midA[biq_sR1] = (highmidR * midA[biq_a1]) - (outSample * midA[biq_b1]) + midA[biq_sR2];
		midA[biq_sR2] = (highmidR * midA[biq_a2]) - (outSample * midA[biq_b2]);
		double lowmidR = outSample; highmidR -= lowmidR;
		
		outSample = (lowmidR * lowA[biq_a0]) + lowA[biq_sR1];
		lowA[biq_sR1] = (lowmidR * lowA[biq_a1]) - (outSample * lowA[biq_b1]) + lowA[biq_sR2];
		lowA[biq_sR2] = (lowmidR * lowA[biq_a2]) - (outSample * lowA[biq_b2]);
		double bassR = outSample; lowmidR -= bassR;
		
		trebleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
		//first stage of three crossovers
		
		outSample = (trebleR * highB[biq_a0]) + highB[biq_sR1];
		highB[biq_sR1] = (trebleR * highB[biq_a1]) - (outSample * highB[biq_b1]) + highB[biq_sR2];
		highB[biq_sR2] = (trebleR * highB[biq_a2]) - (outSample * highB[biq_b2]);
		highmidR = outSample; trebleR -= highmidR;
		
		outSample = (highmidR * midB[biq_a0]) + midB[biq_sR1];
		midB[biq_sR1] = (highmidR * midB[biq_a1]) - (outSample * midB[biq_b1]) + midB[biq_sR2];
		midB[biq_sR2] = (highmidR * midB[biq_a2]) - (outSample * midB[biq_b2]);
		lowmidR = outSample; highmidR -= lowmidR;
		
		outSample = (lowmidR * lowB[biq_a0]) + lowB[biq_sR1];
		lowB[biq_sR1] = (lowmidR * lowB[biq_a1]) - (outSample * lowB[biq_b1]) + lowB[biq_sR2];
		lowB[biq_sR2] = (lowmidR * lowB[biq_a2]) - (outSample * lowB[biq_b2]);
		bassR = outSample; lowmidR -= bassR;
		
		trebleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
		//second stage of three crossovers
		
		outSample = (trebleR * highC[biq_a0]) + highC[biq_sR1];
		highC[biq_sR1] = (trebleR * highC[biq_a1]) - (outSample * highC[biq_b1]) + highC[biq_sR2];
		highC[biq_sR2] = (trebleR * highC[biq_a2]) - (outSample * highC[biq_b2]);
		highmidR = outSample; trebleR -= highmidR;
		
		outSample = (highmidR * midC[biq_a0]) + midC[biq_sR1];
		midC[biq_sR1] = (highmidR * midC[biq_a1]) - (outSample * midC[biq_b1]) + midC[biq_sR2];
		midC[biq_sR2] = (highmidR * midC[biq_a2]) - (outSample * midC[biq_b2]);
		lowmidR = outSample; highmidR -= lowmidR;
		
		outSample = (lowmidR * lowC[biq_a0]) + lowC[biq_sR1];
		lowC[biq_sR1] = (lowmidR * lowC[biq_a1]) - (outSample * lowC[biq_b1]) + lowC[biq_sR2];
		lowC[biq_sR2] = (lowmidR * lowC[biq_a2]) - (outSample * lowC[biq_b2]);
		bassR = outSample; lowmidR -= bassR;
		
		trebleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);
		//third stage of three crossovers
		
		highRIIR = (highRIIR*highCoef) + (trebleR*(1.0-highCoef));
		highmidR = highRIIR; trebleR -= highmidR;
		
		midRIIR = (midRIIR*midCoef) + (highmidR*(1.0-midCoef));
		lowmidR = midRIIR; highmidR -= lowmidR;
		
		lowRIIR = (lowRIIR*lowCoef) + (lowmidR*(1.0-lowCoef));
		bassR = lowRIIR; lowmidR -= bassR;
		
		inputSampleR = (bassR*bassGain) + (lowmidR*lowmidGain) + (highmidR*highmidGain) + (trebleR*trebleGain);		
		//fourth stage of three crossovers is the exponential filters
		
		//begin 64 bit stereo floating point dither
		//int expon; frexp((double)inputSampleL, &expon);
		fpdL ^= fpdL << 13; fpdL ^= fpdL >> 17; fpdL ^= fpdL << 5;
		//inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
		//frexp((double)inputSampleR, &expon);
		fpdR ^= fpdR << 13; fpdR ^= fpdR >> 17; fpdR ^= fpdR << 5;
		//inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
		//end 64 bit stereo floating point dither
		
		*out1 = inputSampleL;
		*out2 = inputSampleR;

		in1++;
		in2++;
		out1++;
		out2++;
    }
}