DermaCheckBoxLabel Not changing con var

[DriedSponge]

I'm currently trying to make a checkbox that toggles a con var I made. Current when I turn the check box off it sets the con var to false but I can't get it to turn it back to true forcing me to do it manually. Any hel would be greatly appreciated. Here's my code:
local convartion = GetConVar("sound_toggle")
SoundToggle = vgui.Create( "DCheckBoxLabel" )
SoundToggle:SetParent( frame )
SoundToggle:SetPos( 25, 500 )
SoundToggle:SetText( "Toggle Sound" )
SoundToggle:SetConVar( "sound_toggle" )
end

[Trackster]

And where are you attempting to change it automatically?

[DriedSponge]

SoundToggle:SetConVar( "sound_toggle" )