This is the file as written by the origional author of the Command Center
I have not rewritten or changed it at all.
-Sage
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Ok in your video folder you should see the following 4 files that match up with the sliders...

eq2ui_sound_master.xml
eq2ui_sound_music.xml
eq2ui_sound_combat.xml
eq2ui_sound_shader.xml

Using notepad open each of the files and look for this line at very end of it:

For sound sliders...

UpperLimit="20" />

you must add a Value="number between 1 to 20" after the UpperLimit="20" but before the /> 

example:

UpperLimit="20" Value="5"/>

note you must have a space in between UpperLimit="20" and the newly added Value="number"

pick a higher number to increase volume or a lower number to decrease (dont change the upperlimit just the Value="number"), whatever the number you put in divide it by 20 and that will give you the number it will show on slider in game, like if you want sound at max 1.000 change it to value="20" or if you want something in between can just throw in whatever number your looking for, like if you want 0.250 as the number on the slider shown in the mod, it would be value="5"

next change this part (it will vary to match slider name):

Combat_music_Volume="0.050"

like in the above example if you set value to 5, using the math 5/20 would equal 0.250 as I noted above, you would change the "0.050" to "0.250" to match

For shader slider...

the settings for the shader works slightly different...

instead of the value="x" being divided by 20 as in the sound files it is instead multiplied by 15

so if you want to set the shader to say 150 instead of 300, you would lower the value (instead of increasing) to value="10"

again make sure not to mess with the upperlimit number or any of the equation numbers

then goto the r_fast_layer_min_distance="300.000" line and change "300.000" to "150.000" to match the new change

hope that helps for setting up your slider values to more preferrable ones for your needs