PHP Code:
#include <amxmodx>
#include <fakemeta>
public plugin_init()
{
register_forward(FM_PlayerPreThink, "fw_PlayerPreThink")
}
public fw_PlayerPreThink(id)
{
if (is_user_alive(id) && get_user_weapon(id) == CSW_KNIFE)
set_pev(id, pev_flTimeStepSound, 999)
}