What is another word for make low sounds?

Here are some words that could be used instead of "make low sounds," depending on the context:

General:

* Hum

* Mutter

* Grumble

* Moan

* Rumble

* Gurgling

* Thudding

* Whispering

More specific:

* Chirp (for birds)

* Croak (for frogs)

* Roar (for lions)

* Growl (for dogs)

* Buzz (for insects)

* Click (for machinery)

Figurative:

* Murmur

* Echo

* Resound

* Clang

* Throb

It's important to consider the specific context when choosing the right word. For example, "hum" would be a good choice for a low, continuous sound, while "thud" would be better for a single, heavy sound.