Took a while, but it definitely works.
At first, I thought this app didnt work and I tried all of the tips but could not get even the audio to work. However, it was the app that installed weirdly especially because I had the previous version called istethoscope without the pro. It kept saying that audio couldnt initialize, but perhaps if u re-download the app. Follow the guidlines and gently place the microphone (bottom left for 4g and bottom right for 3G(s)) at the below your left breast and feel around you should be able to get a clear reading.
Juliette Fahey about
iStethoscope Pro, v1.04