Description

This is a quake style hitsound that can be used to override the default one. For this to work the file needs to be named hitsound.wav, any sound file may be used, this one just happens to be a one many people like and are familiar with.
Simply put the .wav file in

Steam\steamapps\common\Team Fortress 2\tf\custom\mystuff\sound\ui,

and enable hitsounds.
Additionaly you have the option to play with pitch values to alter the hitsound depending on the damage done, 100 is the default value.

tf_dingalingaling “1″
tf_dingaling_volume “1.0″
tf_dingaling_pitchmindmg “100″
tf_dingaling_pitchmaxdmg “100″