diff --git a/Numeric/CubicCurve.hpp b/Numeric/CubicCurve.hpp
new file mode 100644
index 000000000..ad714b887
--- /dev/null
+++ b/Numeric/CubicCurve.hpp
@@ -0,0 +1,69 @@
+//
+//  CubicCurve.hpp
+//  Clock Signal
+//
+//  Created by Thomas Harte on 04/10/2025.
+//  Copyright © 2025 Thomas Harte. All rights reserved.
+//
+
+#pragma once
+
+#include <cassert>
+
+/*!
+	Provides a cubic Bezier-based timing function.
+*/
+struct CubicCurve {
+	CubicCurve(const float c1x, const float c1y, const float c2x, const float c2y) :
+		c1(c1x, c1y), c2(c2x, c2y)
+	{
+		assert(0.0f <= c1x);	assert(c1x <= 1.0f);
+		assert(0.0f <= c1y);	assert(c1y <= 1.0f);
+		assert(0.0f <= c2x);	assert(c2x <= 1.0f);
+		assert(0.0f <= c2y);	assert(c2y <= 1.0f);
+	}
+
+	/// @returns A standard ease-in-out animation curve.
+	static CubicCurve easeInOut() {
+		return CubicCurve(0.42f, 0.0f, 0.58f, 1.0f);
+	}
+
+	/// @returns The value for y given x, in range [0.0, 1.0].
+	float value(const float x) const {
+		return axis(t(x), 1);
+	}
+
+private:
+	/// @returns The value for @c t that generates the value @c x.
+	float t(const float x) const {
+		static constexpr float Precision = 0.01f;
+		float bounds[2] = {0.0f, 1.0f};
+		const auto midpoint = [&] { return (bounds[0] + bounds[1]) * 0.5f; };
+
+		while(bounds[1] > bounds[0] + Precision) {
+			const float mid = midpoint();
+			const float value = axis(mid, 0);
+			if(value > x) {
+				bounds[1] = mid;
+			} else {
+				bounds[0] = mid;
+			}
+		}
+		return midpoint();
+	}
+
+	/// @returns The value for axis @c index at time @c t.
+	float axis(const float t, int index) const {
+		const float f1 = t * c1[index];
+		const float f2 = t * c2[index] + (1.0f - t) * c1[index];
+		const float f3 = t + (1.0f - t) * c2[index];
+
+		const float c1 = t * f2 + (1.0f - t) * f1;
+		const float c2 = t * f3 + (1.0f - t) * f2;
+
+		return t * c2 + (1.0f - t) * c1;
+	}
+
+	float c1[2];
+	float c2[2];
+};
diff --git a/OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj b/OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj
index 0241801e9..5f250f4f4 100644
--- a/OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj	
+++ b/OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj	
@@ -1780,6 +1780,7 @@
 		4B83348E1F5DBA6E0097E338 /* 6522Storage.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = 6522Storage.hpp; path = Implementation/6522Storage.hpp; sourceTree = "<group>"; };
 		4B8334911F5E24FF0097E338 /* C1540Base.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; name = C1540Base.hpp; path = Implementation/C1540Base.hpp; sourceTree = "<group>"; };
 		4B8334941F5E25B60097E338 /* C1540.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = C1540.cpp; path = Implementation/C1540.cpp; sourceTree = "<group>"; };
+		4B847B9F2E920C7500774B9B /* CubicCurve.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; name = CubicCurve.hpp; path = /Users/thomasharte/Projects/CLK/Numeric/CubicCurve.hpp; sourceTree = "<absolute>"; };
 		4B85322922778E4200F26553 /* Comparative68000.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = Comparative68000.hpp; sourceTree = "<group>"; };
 		4B85322E2277ABDD00F26553 /* tos100.trace.txt.gz */ = {isa = PBXFileReference; lastKnownFileType = archive.gzip; path = tos100.trace.txt.gz; sourceTree = "<group>"; };
 		4B8671EA2D8B40D8009E1610 /* Descriptors.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = Descriptors.hpp; sourceTree = "<group>"; };
@@ -3147,6 +3148,7 @@
 				4BD191D5219113B80042E144 /* OpenGL */,
 				4BB8616B24E22DC500A00E03 /* ScanTargets */,
 				4BD060A41FE49D3C006E14BE /* Speaker */,
+				4B847B9F2E920C7500774B9B /* CubicCurve.hpp */,
 			);
 			name = Outputs;
 			path = ../../Outputs;