Yeah, I’ve got a stack of those old analog delay units I keep in my basement. For a low‑profile signature, keep the delay time short—about 50 to 80 ms—so it feels like a natural echo of the footstep, not a separate sound. Set the feedback low, maybe 10–15 %, and mix the wet channel down to a whisper, around 5–8 %. Then run that through a mild low‑pass to cut the high frequencies that would stand out in a quiet environment. A touch of tape saturation will round out the edges and blend it with the ambient hiss. If you want to keep it truly under the radar, add a tiny random jitter to the delay time so the repeat never repeats exactly. That keeps the rhythm intact but makes it sound like a single, perfectly timed footstep.