I purchased a 2011 S4 with B&O audio and have a bluetooth adapter in glovebox and have an iphone7........ just wondering what would be the best options for audio? Would spotify be a good way to go? or would downloading audio files to a 32gb SD card be best? Is the B&O MMI system use lossless format? SD card has to be formatted to FAT32? I'm not overly technical ,so you will have to bear with me with the newbie questions...thanks