hi all,
is it possible to increase the volume the speaker output sends?

the reason i want to do this is i connect my N900 to my car stereo using the headphone out jack plug on my n900 to the aux in on my car stereo... whenever i make a phone call and use the audio sent to my car speakers i have to turn my car stereo volume up from 10 to about 20 to be able to hear the person i am speaking to .... when i end the call and turn my car stereo back to 'radio' or 'cd' it blasts my ears off if i forget to turn it down first! it would also be much easier not having to turn my car stereo volume up in the first place!!!

can anyone help????