I got a 1st and a 2nd generation airport express I want to setup to airplay music to some stereos. I am using a ddwrt router for my network and just looking to the airport express to stream music and maybe act as a repeater. I am totally new to these units, but read that because they are old you need to update the firmware to work with Yosemite and ios8. Something to do with itunes updates. Are there any guides out there that explain how to do this? I have an old p laptop and and macbook on the way.