For some tunes the music automatically keeps up, so I don't have to turn the page. For others it doesn't. Am I doing something wrong? Is there a way to tell which ones have this feature? For that matter, is there any site documentation or is it trial and error?

Thanks much.

Sorry for the delayed response. Although page turns work on most pieces on the site with normal playback they don't currently work with the playalong tracks. Probably the majority of the solo parts for pieces on the site have only one page so for those it's not a problem. Of course we'd very much like this to work on the playalong tracks and we are looking into ways to making that possible - for various technical reasons it's trickier than the main pages. Sorry about that.