Sounds accelerating heartbeat with different ambient noise. Carefully! high frequency noise …

Included files:

Ambient Heartbeat (1) – 0:23 (clean – without noise)

Ambient Heartbeat (2) – 0:23

Ambient Heartbeat (3) – 0:23

Ambient Heartbeat (4) – 0:23

Ambient Heartbeat (5) – 0:23

Good luck!!!