foo_time = 0
foo_time_2 = 0

function foo_time_manipulator(global_var, len, sfx)

global_var += 2
 if global_var < len then
  play(sfx)
 end
end

//so I can write

foo_time_manipulator(foo_time, 2, 02)
foo_time_manupulator(foo_time_2, 3, 02)