diff --git a/crt/shaders/crtsim/composite.slang b/crt/shaders/crtsim/composite.slang
index dbb3b41..7d338b0 100644
--- a/crt/shaders/crtsim/composite.slang
+++ b/crt/shaders/crtsim/composite.slang
@@ -100,11 +100,11 @@ void main()
 	half2 scanuv = vec2(fract(vTexCoord * 1.0001 * params.SourceSize.xy / params.NTSCArtifactScale));
 	half4 NTSCArtifact1 = tex2D(NTSCArtifactSampler, scanuv);
 	half4 NTSCArtifact2 = tex2D(NTSCArtifactSampler, scanuv + vec2(0.0, 1.0 / params.SourceSize.y));
-	half4 NTSCArtifact = lerp(NTSCArtifact1, NTSCArtifact2, 1.0 - params.NTSCLerp);
+	float lerpfactor = (params.animate_artifacts > 0.5) ? mod(params.FrameCount, 2.0) : params.NTSCLerp;
+	half4 NTSCArtifact = lerp(NTSCArtifact1, NTSCArtifact2, 1.0 - lerpfactor);
 	
-	float artifacting = (params.animate_artifacts > 0.5) ? mod(params.FrameCount, 2.0) : 1.0;
-	half2 LeftUV = vTexCoord - vec2(artifacting / params.SourceSize.x, 0.0);//RcpScrWidth;
-	half2 RightUV = vTexCoord + vec2(artifacting / params.SourceSize.x, 0.0);//RcpScrWidth;
+	half2 LeftUV = vTexCoord - vec2(1.0 / params.SourceSize.x, 0.0);//RcpScrWidth;
+	half2 RightUV = vTexCoord + vec2(1.0 / params.SourceSize.x, 0.0);//RcpScrWidth;
 	
 	half4 Cur_Left = tex2D(curFrameSampler, LeftUV);
 	half4 Cur_Local = tex2D(curFrameSampler, vTexCoord);
diff --git a/crt/shaders/crtsim/frame.slang b/crt/shaders/crtsim/frame.slang
index 5a46d4c..3678a4b 100644
--- a/crt/shaders/crtsim/frame.slang
+++ b/crt/shaders/crtsim/frame.slang
@@ -101,10 +101,10 @@ void main()
 	
 	half4 emissive = SampleCRT(shadowMaskSampler, Source, vTexCoord);
 	
-	colorspec += (emissive * blend * Tuning_ReflScalar);
+	colorspec += (emissive * blend * params.Tuning_ReflScalar);
 	
 	half fres = 1.0 - dot(camDir, norm);
-	fres = (fres*fres) * Tuning_Fres_Brightness;
+	fres = (fres*fres) * params.Tuning_Fres_Brightness;
 	half4 colorfres = half4(0.15, 0.15, 0.15, 1.) * fres;
 	
 	half4 nearfinal = (colorfres + colordiff + colorspec);
diff --git a/presets/crtsim-grungy.slangp b/presets/crtsim-grungy.slangp
new file mode 100644
index 0000000..4fa77d6
--- /dev/null
+++ b/presets/crtsim-grungy.slangp
@@ -0,0 +1,66 @@
+shaders = "5"
+shader0 = "../crt/shaders/crtsim/composite.slang"
+filter_linear0 = "false"
+wrap_mode0 = "clamp_to_border"
+mipmap_input0 = "false"
+alias0 = ""
+float_framebuffer0 = "false"
+srgb_framebuffer0 = "false"
+shader1 = ../misc/image-adjustment.slang
+wrap_mode1 = "clamp_to_border"
+mipmap_input1 = "false"
+alias1 = "CRTPASS"
+float_framebuffer1 = "false"
+srgb_framebuffer1 = "false"
+shader2 = "../crt/shaders/crtsim/post-downsample.slang"
+filter_linear2 = "true"
+wrap_mode2 = "clamp_to_border"
+mipmap_input2 = "false"
+alias2 = ""
+float_framebuffer2 = "false"
+srgb_framebuffer2 = "false"
+shader3 = "../crt/shaders/crtsim/post-upsample.slang"
+filter_linear3 = "true"
+wrap_mode3 = "clamp_to_border"
+mipmap_input3 = "false"
+alias3 = ""
+float_framebuffer3 = "false"
+srgb_framebuffer3 = "false"
+shader4 = "../crt/shaders/crtsim/present.slang"
+filter_linear4 = "true"
+wrap_mode4 = "clamp_to_border"
+mipmap_input4 = "false"
+alias4 = ""
+float_framebuffer4 = "false"
+srgb_framebuffer4 = "false"
+parameters = "GRAIN_STR;Tuning_Sharp;Tuning_Persistence_R;Tuning_Persistence_G;Tuning_Persistence_B;Tuning_Bleed;Tuning_Artifacts;NTSCLerp;NTSCArtifactScale;animate_artifacts;CRTMask_Scale;Tuning_Satur;Tuning_Mask_Brightness;Tuning_Mask_Opacity;bloom_scale_down;bloom_scale_up;BloomPower;BloomScalar;Tuning_Overscan;Tuning_Barrel;mask_toggle"
+Tuning_Sharp = "0.200000"
+Tuning_Persistence_R = "0.075000"
+Tuning_Persistence_G = "0.060000"
+Tuning_Persistence_B = "0.060000"
+Tuning_Bleed = "1.00000"
+Tuning_Artifacts = "0.700000"
+NTSCLerp = "1.000000"
+NTSCArtifactScale = "200.000000"
+animate_artifacts = "1.000000"
+CRTMask_Scale = "1.000000"
+Tuning_Satur = "0.900000"
+Tuning_Mask_Brightness = "0.600000"
+Tuning_Mask_Opacity = "0.500000"
+bloom_scale_down = "0.015000"
+bloom_scale_up = "0.020000"
+BloomPower = "1.000000"
+BloomScalar = "0.100000"
+Tuning_Overscan = "0.950000"
+Tuning_Barrel = "0.250000"
+mask_toggle = "1.000000"
+GRAIN_STR = 3.0
+textures = "NTSCArtifactSampler;shadowMaskSampler"
+NTSCArtifactSampler = "../crt/shaders/crtsim/artifacts.png"
+NTSCArtifactSampler_linear = "true"
+NTSCArtifactSampler_wrap_mode = "clamp_to_border"
+NTSCArtifactSampler_mipmap = "false"
+shadowMaskSampler = "../crt/shaders/crtsim/mask.png"
+shadowMaskSampler_linear = "true"
+shadowMaskSampler_wrap_mode = "clamp_to_border"
+shadowMaskSampler_mipmap = "false"