Freelancer needs to install a number of android emulators and route the audio from an emulator to another application. One of the name of such applications is 'audio router'. The audio router must allow to route the audio output (the speaker) of one application to the audio input (the microphone) of another application. For example, you can launch x-lite on your computer, call to someone, and then launch YouTube, play a music, and then route the audio output of YouTube to the audio input of the x-lite. The result will be that the person whom you called will hear the music of the YouTube that your PC plays.
The goal of this job would be to experiment with best audio routing solutions for working with a large number of applications (fifty of android emulators and an asterisk running on the same machine).