diff --git a/crt/shaders/metacrt/metacrt-shadertoy-passes.slangp b/crt/shaders/metacrt/metacrt-shadertoy-passes.slangp
deleted file mode 100644
index b5260b5..0000000
--- a/crt/shaders/metacrt/metacrt-shadertoy-passes.slangp
+++ /dev/null
@@ -1,19 +0,0 @@
-shaders = 3
-
-shader0 = shaders/metacrt/bufC.slang
-scale_type0 = viewport
-filter_linear0 = true
-
-shader1 = shaders/metacrt/bufD.slang
-scale_type1 = viewport
-filter_linear1 = true
-
-shader2 = shaders/metacrt/Image.slang
-scale_type2 = viewport
-filter_linear2 = true
-
-textures = "cubeMap;table"
-cubeMap = shaders/metacrt/basilica.png
-cubeMap_wrap_mode = repeat
-table = shaders/metacrt/woodgrain.png
-table_wrap_mode = repeat
\ No newline at end of file
diff --git a/handheld/lcd-grid-v2-motionblur.glslp b/handheld/lcd-grid-v2-motionblur.glslp
deleted file mode 100644
index 591980e..0000000
--- a/handheld/lcd-grid-v2-motionblur.glslp
+++ /dev/null
@@ -1,28 +0,0 @@
-shaders = "2"
-shader0 = "../motionblur/shaders/response-time.glsl"
-shader1 = "shaders/lcd-cgwg/lcd-grid-v2.glsl"
-
-scale_type0 = "source"
-scale0 = "1.0"
-
-scale_type1 = "viewport"
-scale1 = "1.0"
-
-filter_linear0 = "false"
-filter_linear1 = "false"
-
-parameters = "RSUBPIX_R;RSUBPIX_G;RSUBPIX_B;GSUBPIX_R;GSUBPIX_G;GSUBPIX_B;BSUBPIX_R;BSUBPIX_G;BSUBPIX_B;gain;gamma;blacklevel;ambient;BGR"
-RSUBPIX_R = "0.750000"
-RSUBPIX_G = "0.000000"
-RSUBPIX_B = "0.000000"
-GSUBPIX_R = "0.000000"
-GSUBPIX_G = "0.750000"
-GSUBPIX_B = "0.000000"
-BSUBPIX_R = "0.000000"
-BSUBPIX_G = "0.000000"
-BSUBPIX_B = "0.750000"
-gain = "1.500000"
-gamma = "2.200000"
-blacklevel = "0.000000"
-ambient = "0.000000"
-BGR = "0.000000"
diff --git a/misc/edge-detect.slang b/misc/edge-detect.slang
new file mode 100644
index 0000000..6701f78
--- /dev/null
+++ b/misc/edge-detect.slang
@@ -0,0 +1,83 @@
+#version 450
+
+layout(push_constant) uniform Push
+{
+	vec4 SourceSize;
+	vec4 OriginalSize;
+	vec4 OutputSize;
+	uint FrameCount;
+   float minimum;
+   float maximum;
+} params;
+
+#pragma parameter minimum "Edge Thresh Min" 0.05 0.0 1.0 0.01
+#pragma parameter maximum "Edge Thresh Max" 0.35 0.0 1.0 0.01
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+	mat4 MVP;
+} global;
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+
+void main()
+{
+   gl_Position = global.MVP * Position;
+   vTexCoord = TexCoord;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+float threshold(float thr1, float thr2 , float val) {
+ val = (val < thr1) ? 0.0 : val;
+ val = (val > thr2) ? 1.0 : val;
+ return val;
+}
+
+// averaged pixel intensity from 3 color channels
+float avg_intensity(vec4 pix) {
+ return dot(pix.rgb, vec3(0.2126, 0.7152, 0.0722));
+}
+
+vec4 get_pixel(sampler2D tex, vec2 coords, float dx, float dy) {
+ return texture(tex, coords + vec2(dx, dy));
+}
+
+// returns pixel color
+float IsEdge(sampler2D tex, vec2 coords){
+  float dxtex = params.SourceSize.z;
+  float dytex = params.SourceSize.w;
+  float pix[9];
+  int k = -1;
+  float delta;
+
+  // read neighboring pixel intensities
+  for (int i=-1; i<2; i++) {
+   for(int j=-1; j<2; j++) {
+    k++;
+    pix[k] = avg_intensity(get_pixel(tex, coords, float(i) * dxtex,
+                                          float(j) * dytex));
+   }
+  }
+
+  // average color differences around neighboring pixels
+  delta = (abs(pix[1]-pix[7])+
+          abs(pix[5]-pix[3]) +
+          abs(pix[0]-pix[8])+
+          abs(pix[2]-pix[6])
+           )/4.;
+
+  return threshold(params.minimum, params.maximum,clamp(delta,0.0,1.0));
+}
+
+void main()
+{
+   float test = IsEdge(Source, vTexCoord);
+   FragColor = vec4(test);
+}
diff --git a/presets/bigblur-lottes-multipass.slangp b/presets/bigblur-lottes-multipass.slangp
deleted file mode 100644
index f4ec960..0000000
--- a/presets/bigblur-lottes-multipass.slangp
+++ /dev/null
@@ -1,69 +0,0 @@
-shaders = 13
-
-shader0 = ../crt/shaders/crt-lottes-multipass/old/linearize.slang
-srgb_framebuffer0 = true
-alias0 = "REFERENCE"
-
-shader1 = ../crt/shaders/crt-lottes-multipass/old/horz3minus1.slang
-srgb_framebuffer1 = true
-scale_type1 = source
-filter_linear1 = true
-alias1 = horz3minus1
-
-shader2 = ../crt/shaders/crt-lottes-multipass/old/horz3plus1.slang
-srgb_framebuffer2 = true
-scale_type2 = source
-filter_linear2 = true
-alias2 = horz3plus1
-
-shader3 = ../crt/shaders/crt-lottes-multipass/old/horz5minus2.slang
-srgb_framebuffer3 = true
-scale_type3 = source
-filter_linear3 = true
-alias3 = horz5minus2
-
-shader4 = ../crt/shaders/crt-lottes-multipass/old/horz5.slang
-srgb_framebuffer4 = true
-scale_type4 = source
-filter_linear4 = true
-alias4 = horz5
-
-shader5 = ../crt/shaders/crt-lottes-multipass/old/horz5plus2.slang
-srgb_framebuffer5 = true
-scale_type5 = source
-filter_linear5 = true
-alias5 = horz5plus2
-
-shader6 = ../crt/shaders/crt-lottes-multipass/old/horz7minus1.slang
-srgb_framebuffer6 = true
-scale_type6 = source
-filter_linear6 = true
-alias6 = horz7minus1
-
-shader7 = ../crt/shaders/crt-lottes-multipass/old/horz7.slang
-srgb_framebuffer7 = true
-scale_type7 = source
-filter_linear7 = true
-alias7 = horz7
-
-shader8 = ../crt/shaders/crt-lottes-multipass/old/horz7plus1.slang
-srgb_framebuffer8 = true
-scale_type8 = source
-filter_linear8 = true
-alias8 = horz7plus1
-
-shader9 = ../crt/shaders/crt-lottes-multipass/old/crt-lottes-multipass.slang
-scale_type9 = source
-scale9 = 4.0
-filter_linear9 = false
-alias9 = Reference
-
-shader10 = ../blurs/blur11resize-vertical.slang
-scale_type10 = source
-scale10 = 0.5
-
-shader11 = ../blurs/blur11resize-horizontal.slang
-scale_type11 = source
-scale11 = 0.5
-
-shader12 = ../border/shaders/bigblur.slang
\ No newline at end of file