I know that sound, mawluv... "tickety, tickety, tickety". I have a 1908 Singer 66 Lotus treadle. I'm not using it for this quilt, but I need to get it back out and use it some. It's currently buried under another sewing machine on top of its cabinet and some other fabric and junk. Shameful, I know.
I'm putting last year's Allietare together upstairs on my Singer 301. Beautiful stitches there, too.
PeriWink, glad you decided to jump into the mystery. Can't wait to see what you have going on with your color changes. Will be watching.