audio interface – Using auditory comments with Alexa?

I work on an Alexa skill and we conduct several interactions that may require some form of feedback during or after a success.

I have not really seen any examples of using or not using auditory feedback with Alexa. Do users expect to hear ringtones and beeps? Ideally, I would like to use the color of the ring to indicate a success, but we are not able to do it yet.

Also, as a side note, does anyone know a place to go for UX audio clips?