It's disputed as to whether these horns use an SX90 body or a Buffet S3 Prestige body. My (Pete) *opinion* is that these are SX90s, with the exception of the low B/Bb key, which is an obvious Buffet design.
If you want to change how many album pictures per page, use CTRL+ and CTRL- (Command + and Command - if you have a Mac). 80% looks great on my 4K monitor.