diff --git a/Converters/2.0 to 5.0 Upmix V3 (L).txt b/Converters/2.0 to 5.0 Upmix V3 (L).txt
index 27719dd..5dcbffe 100644
--- a/Converters/2.0 to 5.0 Upmix V3 (L).txt	
+++ b/Converters/2.0 to 5.0 Upmix V3 (L).txt	
@@ -7,7 +7,7 @@ desc: 2.0 to 5.0 Surround upscale BETA
 slider1:0<0,100,2>Width
 slider2:0<-100,100,1>Depth
 slider3:90<0,180,2>Rear threshold
-slider4:90<0,180,2>Crossover width
+slider4:90<0,240,2>Crossover and diffusion (deg)
 slider5:50<0,100,2>Rear Width
 slider6:50<0,100,1>Rear LP
 slider7:0 <0,100,2>Rear transients
@@ -48,7 +48,14 @@ sliderfft = (2^(slider8))|0;
 fftsize != sliderfft ? fft_initialize();
 
 Rear_threshold= slider3*pi/180;
-Crossover_width=max(slider4*pi/180,0.1);//min of 0.1 since don't want an infinite slope/div 0
+
+// crossover & diffusion
+
+Crossover_width=min(max(slider4*pi/180,0.1),pi);//min of 0.1 since don't want an infinite slope/div 0
+// cap to pi to separate crossover & diffusion
+
+diffusion_amount=max( (slider4/180) -1,0); //clamp to >0
+
 width_coeff=slider1/100; 
 
 depth_coeff=(slider2*$pi)/200; //depth scaled from 0-100 to 0>half pi
@@ -288,6 +295,23 @@ pos += 2;
 pos2=(pos2+2)%(fftsize*2);
 
 
+// crossover & diffusion
+
+L_diff=(spl0-spl4)*0.5;
+R_diff=(spl1-spl5)*0.5;
+
+spl0-=L_diff*(diffusion_amount);
+spl4+=L_diff*(diffusion_amount);
+
+spl1-=R_diff*(diffusion_amount);
+spl5+=R_diff*(diffusion_amount);
+
+C_diff=((spl0+spl1)*0.5)-spl2;
+spl0-=C_diff*(diffusion_amount);
+spl1-=C_diff*(diffusion_amount);
+spl2+=C_diff*(diffusion_amount)*1.414; // sqrt2 needed for c since it's only a single channel
+
+
 do_width(width_coeff);
 do_depth(depth_coeff);
 do_cross_width(R_width_coeff);
diff --git a/Converters/2.0 to 5.0 Upmix V3 (S).txt b/Converters/2.0 to 5.0 Upmix V3 (S).txt
index a441374..8f5632a 100644
--- a/Converters/2.0 to 5.0 Upmix V3 (S).txt	
+++ b/Converters/2.0 to 5.0 Upmix V3 (S).txt	
@@ -7,7 +7,7 @@ desc: 2.0 to 5.0 Surround upscale (Small) BETA
 slider1:0<0,100,2>Width
 slider2:0<-100,100,1>Depth
 slider3:90<0,180,2>-Rear threshold
-slider4:90<0,180,2>-Crossover width
+slider4:180<0,240,2>Crossover and diffusion (deg)
 slider5:50<0,100,2>-Rear Width
 slider6:50<0,100,1>Rear LP
 slider7:0 <0,100,2>-Rear transients
@@ -45,7 +45,17 @@ sliderfft = (2^(slider8))|0;
 fftsize != sliderfft ? fft_initialize();
 
 Rear_threshold= slider3*pi/180;
-Crossover_width=max(slider4*pi/180,0.1);//min of 0.1 since don't want an infinite slope/div 0
+
+// crossover & diffusion
+
+Crossover_width=min(max(slider4*pi/180,0.1),pi);//min of 0.1 since don't want an infinite slope/div 0
+// cap to pi to separate crossover & diffusion
+
+diffusion_amount=max( (slider4/180) -1,0); //clamp to >0
+
+slider4<180?slider4=180; // map old slider
+
+
 width_coeff=slider1/100; 
 
 depth_coeff=(slider2*$pi)/200; //depth scaled from 0-100 to 0>half pi
@@ -274,6 +284,25 @@ pos += 2;
 pos2=(pos2+2)%(fftsize*2);
 
 
+
+
+// crossover & diffusion
+// blend front & back channels
+L_diff=(spl0-spl4)*0.5;
+R_diff=(spl1-spl5)*0.5;
+
+spl0-=L_diff*(diffusion_amount);
+spl4+=L_diff*(diffusion_amount);
+
+spl1-=R_diff*(diffusion_amount);
+spl5+=R_diff*(diffusion_amount);
+// blend phantom C & real C
+C_diff=((spl0+spl1)*0.5)-spl2;
+spl0-=C_diff*(diffusion_amount);
+spl1-=C_diff*(diffusion_amount);
+spl2+=C_diff*(diffusion_amount)*1.414; // sqrt2 needed for c since it's only a single channel
+
+
 do_width(width_coeff);
 do_depth(depth_coeff);
 // do_cross_width(R_width_coeff);
diff --git a/Converters/5.1 to 7.1 Upmix V3 (L).txt b/Converters/5.1 to 7.1 Upmix V3 (L).txt
index cfb1ff5..51cde28 100644
--- a/Converters/5.1 to 7.1 Upmix V3 (L).txt	
+++ b/Converters/5.1 to 7.1 Upmix V3 (L).txt	
@@ -319,8 +319,24 @@ mode==1?
 pos += 2;
 pos2=(pos2+2)%(fftsize*2);
 
-mode > 1 ?
+
+mode == 0?
+(
+// blend corners & sides
+L_diff=((spl0+spl4)*0.5)-spl6;
+spl0-=L_diff*(diffuse_amount);
+spl4-=L_diff*(diffuse_amount);
+spl6+=L_diff*(diffuse_amount)*1.414; // sqrt2 needed for SL since it's only a single channel
+
+R_diff=((spl1+spl5)*0.5)-spl7;
+spl1-=R_diff*(diffuse_amount);
+spl5-=R_diff*(diffuse_amount);
+spl7+=R_diff*(diffuse_amount)*1.414;
+
+)
+:
 (
+// blend sides & back
 L_diff=(spl6-spl4)*0.5;
 R_diff=(spl7-spl5)*0.5;