LV has several smoothing window functions, although I'm not sure if any are available in the limited versions of LV, the full pro version 6.1 has (located under Functions->Analyze->Signal Processing->Windows) a couple of Blackman smoothing windows (standard, exact, B-Harris), as well as about 10 other smoothing windows. There are also frequency domain filtering algoriths, of the Butterworth, Bessel, etc. flavor, or just a straight median filter.