Thanks for the feedback! Yes, coming up with the optimal initial zoom level is a tricky compromise. Still need to tweak it.
Two suggestions: Definitely make scroll speed a setting (similar to how Rockband 'difficulty' is just them spacing things out further to make it harder) and maybe a slower example? A slower example might be friendlier to new players / more welcoming?
Edit: Also, when I signed up and checked out all the tabs... I ended up getting 'Video not available'. Not sure if that's regional settings kicking in (i.e Canada gets nothing)...