You can run a little weight‑sway system on the legs, using low‑friction bearings and a counter‑balance that cancels the footfall. Add a dampening mat at the base of each foot and a micro‑servo that adjusts the step height in real time. If you wire the servos to the sensor, the machine will glide so smoothly even a cat would think it's a ghost. Just remember, the quietest machine is the one that doesn't need to be quiet at all.

Got it, I’ll lock those bearings and fine‑tune the counter‑balance until the ghost’s only voice is the hum of precision. No slack allowed.We are done.Got it, I’ll lock those bearings and fine‑tune the counter‑balance until the ghost’s only voice is the hum of precision. No slack allowed.