Vibrating pulse in funscript

So, I’m kind of stumped here. Working on a new script for a CH on the handy, and to spice things up I wanted to change the downtime where no real motion is happening, to sort of a pulse. Going from a slow wave, to a quick “vibration”, back to a slow wave, preferably in a smooth motion.

I did find this topic:

And while it works, it only does the vibration part. I want make more pulsing movements, both for variety and to not melt people’s devices.

Any advice?