The unit is an Alpine. Looking at the manual, it appears that the unit has a "Mix All" function. My flash drive has been loaded with individual files by artist. Customer service and the manual claim that keyboard commands on the head unit will pick out individual songs on a random basis.
I'll see how it works....technology is fun, when you know it is there and how to use it.
Edit: It works.....I feel almost smart.
Thank you for the suggestions.