If you feel the audio files are too big in size (HQ MP3 320 kbps) and you would like to compress them, here are a few ways to do it: With iTunes: https://support.apple.com/en-us/HT204310 Online with Online-Convert: http://audio.online-convert.com/convert-to-mp3 (tutorial here: https://support.sharefaith.com/support/solutions/articles/1000139562-how-to-convert-compress-an-mp3-file) Online with Apowersoft Free Online Audio Converter: http://www.apowersoft.com/free-online-audio-converter With Audacity (free software): http://www.omarali.us/blog/2008/05/shrinking-mp3s-size-using-audacity/