You will first need to install FreeDrive 0.80 FULL from http://www.freedrive.co.uk
I have added Winamp Volume adjustment on D3 voice to this version. Please can someone test it, if its ok, then I will also add it to the speedcam audio.
If you dont want to use the default settings of 40% volume and 3 seconds then just add these lines to your settings.ini
#decreases volume to %
#decrease for amount of time in seconds
If you dont want to use this at all, just set decreaseto = 100
let me know