Matmos was a similar mod that added sounds to Minecraft. But it was discontinued. The official updates have stopped. You can find information here and its Github.
So there are unofficial builds available but not for actual Minecraft versions. I wonder if the some sounds can be used now for AmbientSounds expanding the mod if this is possible.

Dynamic Surroundings does it already, might be a good idea to take a look at that mod:
https://minecraft.curseforge.com/projects/dynamic-surroundings

Does it work with AmbientSounds or does it replace it?

These mods work fine together since Dynamic Surroundings plays sounds from time to time only.