Intonation / Chanting: Compared
Intonation is a valid meditation system. It is not to be confused with what became known as chanting or chanting holy names. Chanting both as japa or ajapa, audible murmuring and inaudible/mental murmuring is not the same as intonation of sound.
Intonation causes the mind to go into a pratyahar sensual energy withdrawal. It could produce higher perception.
This video was shared by Tobe Terrell and is an example of intonation: