Attached to this post please find a link to an article on stair building using the Festool MFS Router Template system to rout both the treads and risers into the stringers at the same time.
I wrote this when I was running training sessions at Festool and the participants found it very useful.
The MFS system is a little tricky to get your head around but when you get the knack of it you’ll find it invaluable.
It’ll work with any router which accepts template guides, (copy rings)
Any comments or questions are always appreciates