Upgrade time remapping

Replace or upgrade the current clip-based Time Remapping rubber band with a dedicated, track-expanding Graph Editor that includes a visual speed/value curve axis and independent Bézier handles. The goal is to allow editors to execute precise, frame-accurate speed ramps directly inside Premiere Pro without being forced to use Dynamic Link to After Effects for standard speed design.

Core Pain Points with Current Tool:

- Lack of Visual Feedback: The tiny timeline rubber band offers no precise Y-axis percentage scaling, making it incredibly difficult to gauge exact speeds or match curves across multiple clips.

- Timeline Destructiveness: Adjusting speed percentages constantly shifts the clip’s internal In/Out points and boundary handles, disrupting the surrounding timeline structure.

- Finicky Keyframe Controls: Splitting keyframe markers and adjusting the blue ease handles on a narrow track is notoriously micro-intensive and prone to accidental selection errors.

Proposed Features & Functionality

1. Expandable Track Graph EditorIntroduce an option to expand the video track into a dedicated Graph Editor view (similar to the current Audio Track Mixer or After Effects Graph Editor).Visual Axis: A clear vertical axis showing speed percentage (e.g., $0\%$ to $1000\%$) and a horizontal axis showing timeline frames.

2. Independent Bézier Handles & Value CurvesAllow editors to manipulate curves using standard, independent spatial Bézier handles ($X$ and $Y$ axes) for precise acceleration and deceleration modeling.Provide presets for common speed curves (e.g., Ease In, Ease Out, Linear, Exponential).

3. Anchor Frame Option (Value vs. Speed)Introduce a toggle to switch between keyframing Speed Percentage and keyframing Time Position (Frame Value).Keyframing the exact frame position would lock specific visuals to specific timeline markers, letting Premiere automatically calculate the speed ramp between them without moving the clip boundaries on the timeline.

4. Synchronised Audio Pitch & Speed RampingEnable the linked audio track to automatically follow the speed curve of the video track, utilising high-quality pitch-shifting algorithms to prevent sudden breaks in audio synchronisation during a ramp.

Why This Matters for the Product:

The editing landscape has shifted. Competitors like DaVinci Resolve offer robust, built-in timeline curve editors, whilst entry-level editors like CapCut provide intuitive, visual speed-ramp templates out of the box. Forcing professional editors to open After Effects via Dynamic Link for fundamental speed adjustments slows down workflows and increases rendering overhead. Bringing a modern Graph Editor to Premiere Pro would significantly improve timeline efficiency and address a decade-long community request.