I can't seem to find details on this model online and would love it if someone out there know of/can provide a website that has information about this machine! Thanks!
I just did some research online and found the Toyota 6600. It appears that the machine does NOT have differential feed. This feed system is nearly a "must-have" for most modern sewing with stretch type fabrics. While this machine does have 3-4 thread functions, I might advise you to look further for a machine that is a little newer and has more functions.