diff --git a/Components/9918/9918.cpp b/Components/9918/9918.cpp
index 247d87eb3..dcaf8efd6 100644
--- a/Components/9918/9918.cpp
+++ b/Components/9918/9918.cpp
@@ -51,6 +51,8 @@ struct ReverseTable {
 Base::Base(Personality p) :
 	personality_(p),
 	crt_(CRTCyclesPerLine, CRTCyclesDivider, Outputs::Display::Type::NTSC60, Outputs::Display::InputDataType::Red8Green8Blue8) {
+	// Unimaginatively, this class just passes RGB through to the shader. Investigation is needed
+	// into whether there's a more natural form. It feels unlikely given the diversity of chips modelled.
 
 	switch(p) {
 		case TI::TMS::TMS9918A:
@@ -84,13 +86,6 @@ Base::Base(Personality p) :
 
 TMS9918::TMS9918(Personality p):
  	Base(p) {
-	// Unimaginatively, this class just passes RGB through to the shader. Investigation is needed
-	// into whether there's a more natural form.
-//	crt_.set_rgb_sampling_function(
-//		"vec3 rgb_sample(usampler2D sampler, vec2 coordinate)"
-//		"{"
-//			"return texture(sampler, coordinate).rgb / vec3(255.0);"
-//		"}");
 //	crt_->set_video_signal(Outputs::Display::VideoSignal::RGB);
 	crt_.set_visible_area(Outputs::Display::Rect(0.055f, 0.025f, 0.9f, 0.9f));
 
diff --git a/Machines/AppleII/Video.cpp b/Machines/AppleII/Video.cpp
index 8da92b058..f54b6a77e 100644
--- a/Machines/AppleII/Video.cpp
+++ b/Machines/AppleII/Video.cpp
@@ -15,14 +15,6 @@ VideoBase::VideoBase(bool is_iie, std::function<void(Cycles)> &&target) :
 	is_iie_(is_iie),
 	deferrer_(std::move(target)) {
 
-	// Set a composite sampling function that assumes one byte per pixel input, and
-	// accepts any non-zero value as being fully on, zero being fully off.
-//	crt_->set_composite_sampling_function(
-//		"float composite_sample(usampler2D sampler, vec2 coordinate, float phase, float amplitude)"
-//		"{"
-//			"return clamp(texture(sampler, coordinate).r, 0.0, 0.66);"
-//		"}");
-
 	// Show only the centre 75% of the TV frame.
 //	crt_->set_video_signal(Outputs::Display::VideoSignal::Composite);
 	crt_.set_visible_area(Outputs::Display::Rect(0.118f, 0.122f, 0.77f, 0.77f));
diff --git a/Machines/ZX8081/Video.cpp b/Machines/ZX8081/Video.cpp
index 7e9416cd3..6989f7d1d 100644
--- a/Machines/ZX8081/Video.cpp
+++ b/Machines/ZX8081/Video.cpp
@@ -25,14 +25,6 @@ const std::size_t StandardAllocationSize = 320;
 Video::Video() :
 	crt_(207 * 2, 1, Outputs::Display::Type::PAL50, Outputs::Display::InputDataType::Luminance1) {
 
-	// Set a composite sampling function that assumes two-level input; either a byte is 0, which is black,
-	// or it is non-zero, which is white.
-//	crt_.set_composite_sampling_function(
-//		"float composite_sample(usampler2D sampler, vec2 coordinate, float phase, float amplitude)"
-//		"{"
-//			"return texture(sampler, coordinate).r;"
-//		"}");
-
 	// Show only the centre 80% of the TV frame.
 //	crt_.set_video_signal(Outputs::Display::VideoSignal::Composite);
 	crt_.set_visible_area(Outputs::Display::Rect(0.1f, 0.1f, 0.8f, 0.8f));