Automatic gear noise.

I just bought a 2004 RSX automatic with 188k miles. Car looks like new, so the miles I am sure is highway. My last Acura was a 1996 Integra 5-speed. I bought this RSX off eBay from a new car trade in at a Acura dealer. Car is nice and drives great! But I do notice a gear noise almost like what a manual transmission would make at low speed when you let off the gas. Sounds like a manual gear box kind of. Is that a normal sound for the 5 speed auto? Car has a heck of a sound system, amp bass speaker touch screen navi , back up camera, Viper 2-way auto start. All for a whopping $2 grand out the door no reserve auction. New tires, new Acura battery. Full tank of gas, perfect interior. Car looks new!So with that said, any thoughts on the noise?

Automatic gear noise.