I hope someone can help me with this,

I have taken apart a multimedia keyboard to use the volume knob to scroll through lists
i have set it up through girder to use the up and down keys and it works in notepad etc
BUT in centrafuse it works to go through playlists etc, but also changes the volume, its really annoying
does anyone know how i can i stop it from changing the volume so it only scrolls though lists

Thanks for the help