Om  To here anahath “AUM” ------needs no extensive practice,

1 put your fingers in the ears , closing them to the external sound, you can here anahath aum, instantly, continuously, here there is no ahath, this is anahath naad

2 utter the letter ''o.........'' for a prolonged time, and at the end'' m'' of aum is heard, here too it is anahath

The sound of the heartbeat is--- not --Anahata, the unstuck sound.

heart beat is aahath, it is stuck sound, muscles doing the beat