The Lessons index page will open in this frame, as will all lessons chosen from  it.
All other pages, for convenience, will open in new windows.

Lessons 1 to 55 & the Sound Key have audio files added where you see this icon .
Doing a bit of trial and error with a new web designer and have changed the audio files to MP3.
Although designed around Internet Explorer 11, the changes should all be compatible with Microsoft EDGE browser
In Microsoft EDGE holding CTRL and selecting MP3 audio icon will play audio in new TAB behind current window.

Feedback appreciated

Alba Gu Bràth