Only strait stitch machines can be used with a frame and stitch regulator.
If you look up stitch regulators it will show which machines you can use with them.
These are cheaper machines like the Brother 1500s which I found for 599 on line. The Janome 6600 is one I think.
These machines are around 9 1/2 inch throats.
I dont know if you can use a computerized machine but do know you cant get a stitch regulator for one.