4A Sounds good to me

frequency

how often something happens or repeats in a certain time, like how many times a sound occurs in a second (measured in Hertz)

soothe

to make someone feel calm and relaxed, like when you listen to peaceful music or sounds that help you relax

ambience

the feeling or mood of a place, which is created by things like the lighting, sounds, and surroundings

put/send someone to sleep

to make someone fall asleep, usually by making them feel comfortable and peaceful

improve concentration

to (help to) get better at focusing on a task, so you can work or study without getting easily distracted

reduce the impact of

to make something less harmful or less important, like how certain sounds can make loud noises less bothersome

sounds like a broken record

to repeatedly express the same thing / complaint

safe and sound

not to have any harm or trouble

sound the alarm

to alert authorities because there is a sign of trouble or danger

be sound asleep (in a sound sleep / asleep soundly)

to sleep deeply and undisturbedly

talk (just) to hear (the sound of) one’s own voice

to talk excessively, often without considering others' input

That sounds like a plan! / Sounds good to me!

the phrase indicates agreement and enthusiasm