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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.
This trainer is known to work well in recent Chrome, Firefox, Safari and Edge web browsers, including mobile versions (which implement the Web Audio API and can be downloaded here). It works in Internet Explorer v11, but has some sound artefacts and several useful features are hidden.
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 It's a bit out of date, but everything should work apart from the donation button!