One of my readers (I have readers ‽ ‽ ‽) recommended the FootBook iPhone/iPad app. The app is a reference manual of Janome machine feet. The manual is thorough and the videos are helpful (I do get buffering issues on my iPad, pausing and replaying the videos work). The only downside is the $6.99 price that is on the high-end of what I pay for apps that I don’t use a lot. A free alternative would be this page with official Janome videos of their accessories.