diff --git a/ntsc/shaders/artifact-colors/artifact-colors0.slang b/ntsc/shaders/artifact-colors/artifact-colors0.slang
index f2031cb..bd6e38c 100644
--- a/ntsc/shaders/artifact-colors/artifact-colors0.slang
+++ b/ntsc/shaders/artifact-colors/artifact-colors0.slang
@@ -16,7 +16,7 @@ layout(push_constant) uniform Push
 	float F_COL;
 } params;
 
-#pragma parameter F_COL "F Col" 0.25 0.25 1.5 0.25
+#pragma parameter F_COL "F Col" 0.25 0.25 0.5 0.25
 
 layout(std140, set = 0, binding = 0) uniform UBO
 {
diff --git a/ntsc/shaders/artifact-colors/artifact-colors1.slang b/ntsc/shaders/artifact-colors/artifact-colors1.slang
index 33f4d14..0e95388 100644
--- a/ntsc/shaders/artifact-colors/artifact-colors1.slang
+++ b/ntsc/shaders/artifact-colors/artifact-colors1.slang
@@ -20,7 +20,7 @@ layout(push_constant) uniform Push
 } params;
 
 #pragma parameter FIR_SIZE "FIR Size" 29.0 1.0 50.0 1.0
-#pragma parameter F_COL "F Col" 0.25 0.25 1.5 0.25
+#pragma parameter F_COL "F Col" 0.25 0.25 0.5 0.25
 #pragma parameter F_LUMA_LP "F Luma LP" 0.16667 0.0001 0.333333 0.02
 #pragma parameter F_COL_BW "F Col BW" 50.0 10.0 200.0 1.0
 
diff --git a/ntsc/shaders/artifact-colors/artifact-colors2.slang b/ntsc/shaders/artifact-colors/artifact-colors2.slang
index 01052d2..30f3c9b 100644
--- a/ntsc/shaders/artifact-colors/artifact-colors2.slang
+++ b/ntsc/shaders/artifact-colors/artifact-colors2.slang
@@ -22,7 +22,7 @@ layout(push_constant) uniform Push
 } params;
 
 #pragma parameter FIR_SIZE "FIR Size" 29.0 1.0 50.0 1.0
-#pragma parameter F_COL "F Col" 0.25 0.25 1.5 0.25
+#pragma parameter F_COL "F Col" 0.25 0.25 0.5 0.25
 #pragma parameter SATURATION "Saturation" 30.0 0.0 100.0 1.0
 #pragma parameter BRIGHTNESS "Brightness" 1.0 0.0 2.0 0.01
 #pragma parameter F_LUMA_LP "F Luma LP" 0.16667 0.0001 0.333333 0.02
diff --git a/presets/c64-monitor.slangp b/presets/c64-monitor.slangp
index b8fde5e..14423b6 100644
--- a/presets/c64-monitor.slangp
+++ b/presets/c64-monitor.slangp
@@ -17,8 +17,4 @@ scale2 = 1.0
 scale_type2 = source
 filter_linear2 = false
 
-shader3 = ../crt/shaders/crt-geom.slang
-
-parameters = "F_COL;FIR_SIZE"
-F_COL = 0.25
-FIR_SIZE = 29.00
\ No newline at end of file
+shader3 = ../crt/shaders/crt-lottes.slang
\ No newline at end of file