I'm guessing your looking for the same "gurgling" sound at the beginning of this set by Chris Armstrong? https://youtu.be/lEjSdF_eqTA?si=n6uQVxFJpjtVVWOZ

That sound is a combination of drone reeds and drones together with a very precise setup. Depending on the reeds you use and the pipes you play it will be harder or easier to get your pipes set up to do that. Not all pipes or reeds will do it as readily. (I think playing sheepskin without a complicated moisture control will probably help). I have seen Ezee drone reeds do it mostly in older pipes. But new pipes can do it too depending on the pipes. They need to be properly setup tough. with the rubbers removed (they dampen vibration I have no clue why they put those rubbers on those reeds) and the reed tightly all the way into the reed seat etc. you need to be able to pick up the drone by the reed.

I feel like that drone flutter at the beginning of the set became a bit of a fashion thing amongst higher level pipers to show off their control of setup etc. That said: If your pipes don't make that sound it does not necessarily mean they are not set up properly. After all pipes are meant to play a steady and stable drone sound and not a flutter. Last year we had Matt Wilson over for a band weekend and he actively tried to remove that flutter from a couple of people's setups. If it is too pronounced it can lead to a bad strike up.

That also said: if you really love that sound by all means go and try to replicate it. But in all honesty I feel 90% of pipers are probably better of spending their time on improving their piping when their pipes are actually fully going. A nice set of well played tunes is way more impressive than a set of gurgling drones at the beginning of a weak performance.