Hi Dave!
The easiest way for you to "restore" all the settings and to undo all the changes you made to the curriculum (inclusive of individual lessons in the curriculum) is to just re-import the curriculum itself.
You get all the original settings back when you do this, so there won't be an issue of an individual lesson having a different set of settings from the others. The only drawback to this is if you want to keep a curriculum lesson which you have already edited, because this is an all-or-nothing kind of restore.
Just in case you need to redownload your curriculum, please follow these steps:
1. Go to your Account Management Page by clicking on 'Account' on the upper right hand corner of any BrillKids website
2. On the top navigation bar, click on 'Purchases'
3. On the left, go to no. 7, Curriculum & License Keys for Little Musician
4. Click on the license key you have in this page, and it will automatically download the content for you.
Hope this helps!