I've fallen down into the rabbit-hole of better sounding digital audio. I'm in the process of upgrading my digital audio files to higher resolution formats. I've added the Onkyo HF Player App to my iPhone 6+ to play my download purchased FLAC files. My CDs are all ripped into AIFFs but all my iTunes purchases are stuck back in AAC format. I wish I could upgrade those purchases to higher quality files. I'm thinking $2 compared to the $1.29 current iTunes prices with an upgrade file charge of $0.61 to ALAC or AIFF. Anybody else want better audio files from the iTunes store?