function newsnd.node_sound_defaults(table)
    table = table or {}
    table.footstep = table.footstep or
            {name="default_hard_footstep", gain=0.2}
    default.node_sound_defaults(table)
    return table
end

minetest.override_item("default:stone",  {
    sounds = newsnd.node_sound_stone_defaults({
        footstep = {name="newsnd_hard_footstep", gain=0.4},
    }),
})