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There are many keyboard shortcuts which can also access additional functions such as playing the next segment. Press ? to list them.
The download buttons download a WAV file of the sound for the segment displayed with a pause at the end defined by the segment gap. Safari does not properly support the download buttons but they can be made to work in the desktop version by holding the Option key when clicking them and then saving the file with the ".wav" file extension.
If you want to use this training software offline then you can download it here. To use it, unzip the file, go into the folder and double-click on "index.html". It's a bit out of date, but everything should work apart from the donation button!