We have a bit of app related news for those who happen to be running a device with Android 4.1 Jelly Bean and also using a set of Etymotic noise isolating headsets. Or more specifically, for those using the hf2-an and mc2-an noise-isolating headsets and earphones. The app is called Awareness Android Phone for Etymotic app.
This app is said to "listen to users surroundings and allows them to mix outside sounds directly into their earphones at a level of their choice." In other words, by using this app, users will be able to program the level of their noise isolation. And for those thinking that you buy noise isolating headphones for one reason -- to cut out all the external sound. Keep in mind that sometimes complete isolation is not ideal.
Take for example, you may want to be able to hear what is going on around you should you decide to go out for a bike ride or a run. Alternatively, we suspect this could be helpful for those who are a bit nosy and like to listen in on others conversations while at the coffee shop. Of course, the key here is that you can adjust the noise isolation levels, not that you have to.
That all being said, while the app is available by way of the Google Play Store, you will want to first visit the Etymotic website. A visit to the website will provide you with a few necessary items with the first being able to make sure your headphones are compatible. And secondly, a visit to that site will get you an unlock code.