It is a "flute of bread" made of one or two lines of canes ( the former or previousone and the latter or posterior one), tied as a raft from the longest one to the shortest one. The canes of the former line have its top ends open and the bottom ends close by a natural knot of the cane.The lines of the latter plane have the previous end cut by a bevelled edge and it is half of the other ones.
How the sikus is made:
It was made of stones and terra cotta during the Preincan cultures.Nowadays it is manufactured with canes of different shapes or with tubes of feather of condor ( a bird that lives in the Andean region to Ecuador and has a large kind of vulture).
The best siku has thirteen (13) tubes divided in two parts fastened : a part with six tubes called IRA and the other part with 7 tubes called IRKA. This siku belongs to the MALTS size(medium siku).
It is tuned in the diatonic scale of greater SOL. There is another variety of siku whose tuning is arranged to European scales. One could obtain the chromatic scale covering part of the mouthpiece of the pipe and regulating the sound with the inferior lip, while the instrument takes a horizontal position, being able to alter the canes to a lower semitone. 104 notes are achieved with thirteen tubes.
Aerofono, wind instrument of edge or flute without channel of blowing.
Its origin is unknown, since it is spread along the world.
Some communities of aborigines use it as rituals devoted to death. It is used to idiolize native, cruel, kind and inhuman gods. It was used in some groups together with drums and other rhythmic instruments in parades.
Jujuy and North of Salta.