I use this technique A LOT instead of quilting in the ditch. This is how I do it: Using my walker foot (not necessary, but nice), I set my stitch selection to #25 on my computerized sewing machine (Brother SQ915). I change the stitch length from whatever it says it is to the maximum, which is 4 and 7. (If you want a smaller wavy line, make the numbers smaller -I used 2.5 and 4.5 on a small item I was quilting. If you can select this "wavy line" on your machine, just take a scrap piece of fabric and run it at the length it presets to, then experiment until you find what you like. Unless I absolutely HAVE TO quilt in the ditch, this is what I use instead. Oh, and the back looks just lovely with these wavy lines. HIGHLY RECOMMEND THIS TECHNIQUE!