[Steven]

Mobilesheets allows horizontal scrolling already. For example, if you have a one page score with five braces lines, you make five copies of the page, rotate them and then crop them into a sequence of strips. Next rotate your computer screen (by software for Windows 11 or by turning a phone or tablet sideways) and you will have horizontal scrolling of your score. Mobilesheets makes it easy (and fast) to do this and even though the rotation aspect is not baked into the software (yet?), you will soon get used to using the software sideways.  The feature is amazing for piano practice and even more important, it turns a smartphone into a usable sheet music reader.  Practicing music with horizontal scrolling feels a lot like playing a video game and it is a good substitute for metronome practice.