This instrument is played by the specific technique of the air inserting in the instrument. There are no hard and fast rules regarding the playing. The more you get the clue how to produce the different variations of tones and rhytm simultaneously, you will sound better on this Magical flute.
This flute is in the Higher category of the instruments of such type.
Video with this frula you can see on this link: https://www.youtube.com/watch?v=BPa8nKarWfM
If you buy this frula, it would be good to maintain it in such a way that you buy parafine oil in pharmacy, and you take long hard wire, on the end you fix some small cloth, and you put the oil on the cloth and you apply the oil in average normal quantiti to the inside of the flute, to make it protected with oil. From outside it is not necesarry to oil it.