I have used the tape makers for purse straps, etc. I haven't used the specialty foot though. I cut the strips about 1/8 inch shorter than instructed. The fabric is easier to go through the slots. Yes, starch is good for this technique.
Go to the 20 minute mark to see a quick and easy way to make tape.
https://www.youtube.com/watch?v=NA41A5dBi70