Yesterday I used the Earpiece app and discovered it doesn't work on 4.2.2 anymore. And on 0% volume boost it's louder rather than on 100% volume boost, but by switching very swiftly between 0% and 100% it actually increases for about a second with 100%.

Since the developer advices to be careful with an increase over 40% in relation to possible damage to the earpiece and your hearing, is it possible that my earpiece got damaged from the few times the volume actually got increased with 100%?

Edit: Or is it possible to hear if it has been damaged?

 

No, I don't really hear anything out of the ordinary. Would it be easy to hear?