problem with low dialer sound volme

[night lord]

hi
sorry about bad english

in my x10 dialer . when i am trying to dial numbers , when i press the numbers the beep sound volume is very low but in emergency call dialer the sound volume is good.
when i bought the phone , it was working good but after some times it became low . i dont know how it is!. in mediascape and ringing and ets its good there is no change in sound volume and its perfect like first use.
i instal no program on my x10.
and i change all setting in sound and dispaly but it doesnt became good.
how can i make it like first day of use ??