How do I recreate this effect?

[flora-nova]

So one of my favorite songs ever is Alone/With You by Daughter and it has this really cool pulsing sound in the background and I want to find some way to do something similar. Here's the track: https://www.youtube.com/watch?v=YWa4ZuGCxnY I could probably do that with automation or something but I have no clue how. Thanks in advance

[musikbear]

pulsing sound in the background

yes, it is a LFO ramping of an envelope
Try these settings:

with any pad notes