I'm a Spreaker engineer. Developing Spreaker Studio (for iOS and Android) took a great effort, but we're actually pretty satisfied with it.

It's basically a broadcasting studio on your mobile device: you can record or broadcast LIVE audio, mixing your voice, music, sound effects and playlist (iPad / tablet only). You can also chat with your listeners and get detailed analytics, including geolocation and demographics charts.

If you've a couple of minutes, give it a try and leave your feedback. Thanks!