When I listen to the sound of the individual words, the first two words are pronounced exactly the same. Is this correct?
When I listen to the entire sentence, there is a difference. I think there's some oddity in the single-word playback?
Hmm. Two years later (9/21/18), there's clearly a difference between все and всё in the word-by-word mode, and yet both words sound like всё in the intact sentence. Apparently the opposite of two years earlier! It's as if they fixed the individual word part, but counterproductively re-recorded the whole sentence with an a mispronunciation of the first word, as if it were всё!
A declension table for:
Adjective: весь - "all, the whole"