Why can't I get an audio input in VoiceJam
When starting up VoiceJam for the first time on iOS7 it says "VoiceJam would like to access your microphone." and gives a dialogue to accept or not. If you did not accept you will have this issue.
To Resolve this, take a look in your Settings/Privacy/Microphone and make sure that the little slider is engaged (green background). If it's not, then VoiceJam would not be allowed to use the mic by the OS.