Originally Posted by Rose Marie
only strait stitch machines set up on a table can have a stitch regulator added.
Bernina has a bit of technology they call the BSR - Bernina Stitch Regulator. Their machines can be placed on a frame, or used as a sit-down stitch regulated free motion machine. That being said, they're *hideously* expensive - my 440 in Canada costs nearly $4,000 new. The Mid-Arm 820 and 830 also come with a BSR (I think), and they can be placed on a frame as well (In fact, Bernina does sell a frame for these machines, but I've heard any frame will work.)
The BSR is tricky to use, and can sometimes not produce the world's most consistent results. I get a lot of skipped stitches, and if the fabric is very plain or very shiny it doesn't work very well. (I'm fairly certain the technology is similar to that which is found inside an optical mouse.) It's wonderful, though, if you're working on small projects (like coasters, quilted pillows, or bags) that are impractical to load onto a frame.