▁ 2 0 1 1 ▁revision ▁of ▁the ▁Horn b ost el – S ach s ▁system ▁by ▁the ▁M I MO ▁Cons ort ium ▁as ▁ 4 2 1 . 2 3 ▁— ▁Fl utes ▁with ▁internal ▁du ct ▁formed ▁by ▁an ▁internal ▁b aff le ▁( natural ▁node , ▁block ▁of ▁res in ) ▁plus ▁an ▁external ▁tied - on ▁cover ▁( c ane , ▁wood , ▁hide ). ▁This ▁H S ▁class ▁also ▁includes ▁the ▁Sul ing . ▁ ▁Although ▁Native ▁American ▁fl utes ▁are ▁played ▁by ▁direct ing ▁air ▁into ▁one ▁end , ▁it ▁is ▁not ▁strictly ▁an ▁end - b low n ▁fl ute , ▁since ▁the ▁sound ▁mechanism ▁uses ▁a ▁fi pp le ▁design ▁using ▁an ▁external ▁block ▁that ▁is ▁fixed ▁to ▁the ▁instrument . ▁ ▁The ▁use ▁of ▁open ▁finger ▁holes ▁( f inger ▁holes ▁that ▁are ▁played ▁by ▁the ▁direct ▁application ▁and ▁removal ▁of ▁fingers , ▁as ▁opposed ▁to ▁keys ) ▁class ifies ▁the ▁Native ▁American ▁fl ute ▁as ▁a ▁simple ▁system ▁fl ute . ▁ ▁History ▁▁ ▁There ▁are ▁many ▁narr atives ▁about ▁how ▁different ▁Ind igen ous ▁pe op les ▁of ▁the ▁Amer icas ▁invent ed ▁the ▁fl ute . ▁In ▁one ▁narr ative , ▁wood pe ck ers ▁pe ck ed ▁holes ▁in ▁h ollow ▁branches ▁while ▁searching ▁for ▁term ites ; ▁when ▁the ▁wind ▁ble w ▁along ▁the ▁holes , ▁people ▁nearby ▁heard ▁its ▁music . ▁Another ▁narr ative ▁from ▁the ▁T uc ano ▁culture ▁describes ▁U ak ti , ▁a