Thanks. This is for a family member. Transferring the music to a flash drive doesn't seem to be an option that this person wants to do.You could transfer your CDs to a flash drive and play music by selecting the USB source on the screen
Search on this forum as others have done this.
As to what CD player, any portable CD player will work using a 1/8", (3,5mm), male to male cable to connect the cd player to the aux jack in the console.
Has anyone tried a USB CD player, and if so, can someone link to the CD player model they got?