Terror Tuesday: The Room Tone

Those things that share our spaces, but cannot
Be sensed by humankind, sometimes are found
By strange experiments. Sometimes, unsought,
However, they're discovered through their sound.
Such happened as a narrator, by night
Was cleaning up her day's recording work.
She'd worked to make her studio just right,
But still, persistent noise would cause a jerk
Of grim annoyance. As she analyzed
The tones beneath her room tone, she'd a shock.
Such whispers, such foul utt'rances, disguised
As emptiness! Each ticking of the clock,
Persuading us, in silence, to do ill,
Perverting ev'ry talent, ev'ry skill!