Any way to turn down music volume on symbian games on Nokia E51?

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Hi, There's some problem when I play games, the sound is too loud! In the games I can only switch the sound on or off, but its not adjustable the volume. And then in the settings, if I switch 'warning tones' off, all the sound dissapears from the game, but if i have the sound on, I can't adjust with the rocker on the side. is there some way to adjust this?