kathy -- Bailey's sells a "stitch regulator" (or so they call it on their site) -- is that what you are referring to?
I have a 15" Bailey that I use on a Little Gracie II frame. Overall, I'm pretty happy with it; the throat is plenty big enough for what I want to do. It's definitely a no-frills kind of machine, and when first using it, there is a lot of frustration. I also am not particularly happy with the stitch regulator, as it doesn't seem to "regulate" stitches very well. My first machine was a Juki with a Grace stitch regulator, and it regulated stitches perfectly -- it slowed down and speeded up as you did; the Bailey stitch regulator doesn't really do that very well, IMHO. But really, you can't beat the price for the Bailey, and generally, I'm pretty happy with it. I will definitely upgrade to something with more options and a better stitch regulator in a few years, though.