Unity android sound problem!

I bought the android basic and when a put the game to my cellphone motorola defy the sound is playing like a reverb.

The music and sound effects all sounds in my game is a trash .
I put the sound out the game in the phone and it is clean . ANgry birds sound is clean .

I tried all configurations ever with 2D sound . The problem is in Unity !!!

What are you doing with this problem ???
thank you !

You have failed to provide sufficient information. What model is your current phone? How many sounds are you playing? Do you have reverb or any other effects running?

If you create an empty project with one sound, is that sound clear?

ok, I created a project with a camera and one sound source. the sound is ok .
In my official project I have only one sound the others are instantiated little sounds for explosions that are killed after 2 seconds .
the game start with a short music with 7 seconds that is reverbering . I m not using sound effects like reverb I have android basic with this phone to test:

http://pdadb.net/index.php?m=specs&id=2602&view=1&c=motorola_defy_mb525_motorola_jordan

I ll keep in tests .
Any help ll be great .
thanks !

finally !!!
I did it ! all the songs are perfect now !!!
What did I do ?
in projects settings audio I put to stereo . in player settings Optmization I put to net.2.0 subset that was only net 2.0 before.

Is perfect now but this is strange for me because I thought that the sound had to be mono for cellphones
thank you all !