Jai Sri Ganesha,
Sound is define feature of sky in five basic elements,
But it could be made available in all the five with truth and the cause,
Air is vital truth among the five which connect spirit with source and harmonize the body of five,
Sound pitched at this truth indicate a lot in silent feature, eight sounds can be heard while Pran Vayu enters in Sushimna Nadi, only yogis and wakeful soul can tune it to reach at for message it bear with,
May Lord bless all,
Thanks please