I ve been playing "medieval " bagpipes for more than 30 years now.
The loud “eastgothic” pipes with big bells had been invented in East Germany.They normally have an complete open fingering system. The range is normally 9 tones, with very few extra chromatic notes. Drone sound is strong
They had no access to western European traditional bagpipes (mainly French cornemuse du centre), which influenced west German makers during the 70/80th folk revival .
These are not as extreme loud ,have a half closed fingering system with a left hand thumbhole, offering more chromatic notes and a half second octave.
The drones are often not very loud, because in the traditional French setting the hurdy gurdy delivers that
The Huemmelchen has a cylindrical bore, therefore there’s no second octave.
It s not very loud, depending on the constructional details.
Often baroque recoder fingering is applied for more chromatic notes.
This requires rather smaller finger holes, which results in a quieter sound.
What is helpfull for both French cornemuses and baroque fingering huemmelchens is the option for having several scales to the same drone and fundamental, playing both major and minor scales without retuning the drone.
Galician gaita offers that too but you only have a major 7th in minor below the fundamental when playing that way, in minor as well.
Gaita fingering is open fingering but quite chromatic.
You can step up one note (using D as fundamental on a C gaita, pinkie and ring finger opened)
Gaita drones normally have no extra hole for the D
C gaitas normally offer a bit of a second octave
But they are high pitched anyway and often felt too annoying for longer indoor use
There are lower tuned gaitas down to G (I like the sound more than the French), but depending on the makers construction there are only some with some extra second octave notes)