What ways can I make a sound stop when certain conditions aren't met?

Example Attempt #1

while true do
	wait()
	if O.Value == true or O2.Value == true then
		M:Play()
		wait(M.TimeLength)
	else
		M:Stop()
	end
end

I apologize for any lack of detail in my explanation. I've been scripting/coding/programming a sink (and other things) for several hours trying to intergrate different things and I'm a little worn.

My Problem

So what I'm working on right now is a sink, and while everything works completely fine I decided to add in a sound effect of running water. It works as I want it to like it is, but I realized if I were to turn off the sinks water the sound would play until the sound is completely done and then it stops ( and yes, I do know the reason behind that is because I have it wait the time of the sound, but this is the only example I could provide of what I've tried.) I have two variables, O and O2 that determine if either of the faucets are on, and when you click a button ( equivalent of turning sink knob ) the water runs and the sink is considered 'on.'

But what I can't seem to figure out is how would I stop the sound from playing instantly once both sinks are off( because the sound will still play as long as one is on as intended ).

Question

So in short, how would I stop the music/sound stop playing the minute both variable values == false? Am I even on the right track or is this a bad approach?

Thanks for the help!

I don't actually get it, but I think this might help you? Could be this:

if O.Value == true or O2.Value == false then -- if ONE of these variables = false then
--run code
end

Or this:

if O.Value == true and O2.Value == false -- with the "and", the if statement will only run if BOTH of these are false
--run code
end