Hi!   Brand new XPS 9570....  Bought a TB16 dock....

When I plugged my external speakers in for the first time, a popup came on the screen.  I clicked something on it and made the terrible mistake of telling it not to come up any more.   Whatever I clicked made the speakers sound TERRIBLE.   The audio sounds tinny and compressed and unusable.   I'm thinking I told it I had small speakers or something that mis-matches.   

How do I get this popup to come back?  I've seen other posts but they talk about Dell Audio Manager or MaxxAudio... I have neither on my XPS 9570.  It just says "Realtek(R) Audio" for the built-in headphone jack/speakers and "Realtek USB Audio for the speaker/Headphone jack on the TB16 dock.

Before purchasing the TB16, I was using a Pluggable Thunderbolt 3 dock that had for my old MacBook Pro....   The sound was great.  So I know it's not my speakers or my XPS.  I had to buy a new dock because the Pluggable didn't supply enough power.

Thanks for the help!  This is driving me nuts!