Soundcite was produced by the Northwestern University Knight Lab as a way to make inline audio "easy and seamless" to produce. Simply record your audio file (in AIFF, WAVE, FLAC, OGG, MP2, MP3, AAC, AMR or WMA formats) and upload it to SoundCloud. Or, if you don't have your own audio, search the SoundCloud directory for the clip you need. Then, copy the file's URL into the Soundcite page, and it'll give you the embed code for the online version of your story.
For example, I wanted to add audio to my Christopher Hitchens obit. I searched SoundCloud and found that HachetteAudio had uploaded an excerpt from his memoir "Hitch 22." I grabbed the URL, pasted it into Soundcite and embedded the code into the obit. Very easy.