How do I do when a player touches a part cave sounds and nature sounds are gone?

Hi there, In my game there is a cave and a forest, I have a script (shown below) that makes day ambience and night ambience, but I don't know how it should work that when the player touches the part he hears cave noises and if he just touches another nature noises again so that he hears completely normal night ambience and day ambience again.

The script i use for the day and night ambience:

local nightSound = game.SoundService.nightSound -- Enter night sound location here
local daySound = game.SoundService.daySound --Enter day sound location here
local CustomMusic = game.SoundService.CustomMusic --Additional Music

while true do
	local Time = game.Lighting.TimeOfDay
	Time = (Time:gsub("[:\r]", ""))
	Time = tonumber(Time)

	if Time >= 180000 or Time < 60000 then
		--Between 1800hrs and 0600hrs


		wait(0.1)
		if daySound.Playing and CustomMusic.Playing then daySound:Stop() moriohSound:Stop() end
		if not nightSound.Playing then
			nightSound:Play()
		end

	else
		--Between 0600 hrs and 1800hrs

		if nightSound.Playing then nightSound:Stop() end
		wait(0.1)
		if not daySound.Playing and not CustomMusic.Playing then
			daySound:Play() 
			CustomMusic:Play()
		end
	end
end