It is easy, here is a macro for a rifle shot, smoke at the source, a blood spatter at the target, and a loud bang. This is calling an attack macro in a SWN sheet, between the "%". I know a S&W .40 is much lower than a rifle in pitch for you purists, most people think a rifle is louder than a pistol... /em @{selected|token_name} fires a rifle at @{target|token_name}
/w GM Target AC:[[@{target|bar2}]]
%{-M8umvHfytiYO_K3D0F8|repeating_weapons_-m9gzuqd2mt2abzxzzmp_attack}
/fx glow-smoke
/fx glow-blood @{target|token_id}
!roll20AM --audio,play,nomenu|smith & wesson 40