What do all the holes do on the Swedish Säckpipa?

What do all those holes do on the Swedish säckpipa? I've made a little video.
If you want to see the fingering chart you need to go to my website:
musicroom.nyckelharpa.me.uk/le...

[@QerstyBass]

who built your säckpipa?

[@pipervix]

Alban Faust: www.albanfaust.se/en/startseite/