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Vance Ingalls
f6f0e4cf2a
A lane's `t` is "seconds from the start of the clip" — HfAutomationPoint says so, and the render honours it: prepareAudioTrack cuts the wav with `-ss mediaStart`, so its t=0 IS the clip's start, and normaliseEnvelope subtracts trackStart. Preview fed `relTime` instead, which is MEDIA time: it carries mediaStart, scales by playbackRate and wraps on a loop. So the same envelope played somewhere else than it rendered. `data-media-start` past the last point held the final value from the first frame and never faded; `playbackRate: 2` ran the envelope at double speed in preview only; a looping clip restarted the envelope every lap in preview while the render baked it once. The FX lanes shipped in this same stack already use clip-local elapsed. There is one time base for automation, and this makes the volume lane use it.