Pitch-shifting a sample classically affects duration:

• Varispeed (⇔) — like a tape machine. Pitching up makes the sample shorter; down makes it longer. Tight, transient-true; great for drums.
• Preserve length (⏱) — routes through a granular AudioWorklet that decouples pitch from duration. Hann-windowed 40 ms grains at 75% overlap (4 grains active at any moment) with Catmull-Rom cubic interpolation, so high frequencies and transients survive ±2-octave shifts cleanly. Best for melodic loops where you want to play across the keyboard without speed changes.