These settings are specific to the current PDF loaded. Set Link will link the current playing song. This is the same as the link icon in the Music Controller. Unlink music will break the link between the current PDF and any song from the iTunes library. Remove all support files will delete all supporting files that unrealBook created. The supporting files store the drawing, transmogrify data for each PDF. Compress will try to compress a slow file and make it turn faster. Once you have chosen this command, load another PDF, then load the compressed PDF again to notice the difference. Look Ahead Speed will adjust the look ahead speed for the entire document in seconds. If speed is zero, look ahead will be disabled on the current file. Remember last page is only used when you are not in set list mode. It will return to the last viewed page of a document when it is reloaded. Email a zip of this file will allow you to email a zip file containing the PDF and support files for the current document. Useful if you want to email the current chart to another unrealBook user.