ness ▁of ▁the ▁angle ▁of ▁the ▁splitting ▁edge , ▁ ▁whether ▁the ▁finger ▁holes ▁are ▁burn ed ▁or ▁b ored ▁into ▁the ▁body ▁of ▁the ▁fl ute , ▁ ▁the ▁design ▁of ▁the ▁mouth pie ce ▁( bl unt ▁and ▁placed ▁against ▁the ▁lips ▁vs . ▁designed ▁to ▁go ▁between ▁the ▁lips ), ▁ ▁the ▁tim bre ▁of ▁the ▁sound ▁of ▁the ▁fl ute , ▁or ▁ ▁details ▁of ▁the ▁f ing ering ▁for ▁the ▁primary ▁scale . ▁ ▁Branch ▁fl utes ▁▁ ▁While ▁many ▁contemporary ▁Native ▁American ▁fl utes ▁are ▁craft ed ▁from ▁mil led ▁l umber , ▁some ▁fl utes ▁are ▁craft ed ▁from ▁a ▁branch ▁of ▁a ▁tree . ▁The ▁construction ▁techniques ▁vary ▁widely , ▁but ▁some ▁mak ers ▁of ▁branch ▁fl utes ▁will ▁attempt ▁to ▁split ▁the ▁branch ▁down ▁a ▁center line , ▁h ollow ▁out ▁the ▁inside , ▁and ▁then ▁mate ▁the ▁hal ves ▁back ▁together ▁for ▁the ▁completed ▁fl ute . ▁ ▁Double ▁and ▁Multiple ▁fl utes ▁▁ ▁A ▁double ▁Native ▁American ▁fl ute ▁is ▁a ▁type ▁of ▁double ▁fl ute . ▁It ▁has ▁two ▁sound ▁ch amb ers ▁that ▁can ▁be ▁played ▁simultaneously . ▁The ▁two ▁ch amb ers ▁could ▁have ▁the ▁same ▁length ▁or ▁be ▁different ▁lengths . ▁ ▁The ▁secondary ▁sound ▁chamber ▁can ▁hold ▁a ▁fixed ▁pitch , ▁in ▁which ▁case ▁the ▁term ▁" dr one ▁fl ute " ▁is ▁sometimes ▁used . ▁The ▁fixed ▁pitch ▁could ▁match ▁the ▁f ing ering ▁of ▁the ▁main ▁sound ▁chamber ▁with ▁all ▁the ▁finger ▁holes ▁covered ,