Latest word that I received from Janome: "The Hemmer foot can be used to sew flat Felled seams on sheers. See the link below:
http://content.janome.com/index.cfm/...eams_on_Sheers
The Hemmer foot would not help when sewing Flat Felled seams on heavy fabric." and "There are many excellent videos and tutorials on the internet that would help you sew a Flat Felled Seam without a specialty foot. Here is one that we like:
http://www.coletterie.com/tutorials-...at-felled-seam "
So, Janome doesn't make a flat fell foot like Bernina, so I guess that those of us with Janomes will have to try these methods.