Just klick on the Tank You want, and press Fire!, there are 3 Autoloaders and 1 standard medium tank. If the Button is dark, you cannot fire, if its light you can fire.
This sounds are not mine, i just extracted them, from fsb banks, which come from Gnomfather (link below) http://www.worldoftanks-wot.com/mods/historical-realism-gun-sounds-mod/ This is just a preview for his mod!