I did notice the changeable speed meter. I was simply making the point that I'm a native English speaker with a pretty high wpm typing speed and I struggled to keep up whilst regularly having to hit Pause, type the last few words, hit Play, get my cursor back into the typing box and catch up with the last couple of words that were spoken while I was moving my cursor. Even if I use the Pause/Play button on my keyboard instead, it took the cursor out of the typing box while on Pause and it had to be put back there manually after hitting Play. Do you foresee people mainly using that particular section on a laptop/desktop or on a mobile?
With hindsight, I've realised I was using it almost as a dictation (audio typing) test rather than a memory test. If I'd simply listened to it a few times, then tried to type the whole thing in in one go without the audio playing at the same time, it would have been a test of my memory instead. However, if it's a memory exercise, I'm not sure how it helps with learning English, other than the potential new vocabulary/grammar. However, without an explanation of the associated vocabulary/grammar, what's the objective of getting learners to memorise a sentence without understanding it? I think the potential new vocabulary/grammar points need hyperlinks that take learners to a dictionary or grammar site for further learning.
Also, I've just noticed that at the bottom of each screen is a transcript of the listening test. Surely once a user realises that the text is right there on the screen for them, they'll potentially just copy it into the text box and get 100% every time!