Is there ANY means to alter the ear speaker audio quality besides the volume buttons? I get very muddy sound from the other party when they speak. It's difficult to distinguish the words. Getting more high frequencies is what I'd appreciate a lot. I don't think it's a question of the GSM codec since some other phones (and older Nokia phones) have much clearer sound. The speaker on my E55 is not defective, the sound is common to other newer Nokia phones I've used, but I wonder if there is some method to change the low pass filter settings or similar.