Please forgive me if I come off a little stupid here!

I use an app called mp3 recorder for quite alot of recording. Basically I would like to know where the recorder is on the phone physically? I say this because I thought it was on the back of the phone, therefore I would put my phone on the front to enable the best quality, but it's not as clear as it should be. And whats weird is when I move my phone about in the recording it actually becomes clearer, but I just cant remember how I had my phone!

I hope that makes sense! (no pun intended)