When tring to use the smule app using my earphone I can't hear myself while singin and after I saved the file, it sounded muffled and grounded. I tried using different earphones but the result are all the same. I don't know if my earphone jack is broken. And also the headphone symbol is not showing up on my notification while an earphone is plugged in. Is it normal.? By the way im using the samsung galaxy s6 edge. Thanks.