imac alsa overdrive

it's much too loud. even if its one singel point over zero. any ideas?

i looked a bit around and found this. setmixer -V gives root@ubu:/home/stereo # setmixer -V vol - 0,0 speaker - 0,0 line - 100 mic - 100 cd - 100 igain - 0,0

but i can't change the line-output down to 50. the mixer seems dead in that position setmixer vol -50 does it, but setmixer line -50 does nothing

it's a pitty, anybody with similar problems? i have an imac 350 slot-loading blueberry

thanks stereo