I used a technique we developed at Expressjet when we were flying the Envoy birds. Set a hard altitude at each “gate” fix between the top and bottom, with the last 2 digits the speed. Ex: between FL240 and FL200 at 290 knots, I’d set something like 22029 at that fix. Then, to get TOD to pop up, set an initial VS. Then check the VTO page for the VS required to make the next fix, and set the altitude selector for the bottom of the STAR like you would on the 175. Fly the plane with the VS knob and adjust thrust and drag for speed. Lots less noise from the altitude selector on the way down that way. Just keep an eye on your required VS and you should be golden.