Same passage, every clip. Vendors are hidden until you tap Reveal. For each clip: naturalness 1–5 (5 = I would forget it is synthetic), "whole book" = you would listen to a 10-hour book with this voice, notes for anything you noticed (robotic numbers, odd pauses, mispronunciations). Watch the highlighted word while it plays: that is the vendor's own timing data, so a lagging highlight is a vendor problem, not a bug here. The original toggle plays the vendor's file instead of the 64 kbps AAC the app would serve; if you hear a difference, say so in the notes. Ratings are kept on this device; tap Upload ratings when done.