Here is the Standardized Average coded by Mladen for MT4.

As explained by Mladen:
Standardized moving average ...

Even though it does not look like a moving average at a first glance, it can be treated as one.

It is a standardized moving average (it is standardized using margin of error) The interesting thing about it is that, unlike other oscillators derived from moving average, this one tends to have fixed minimums and maximums (depending on the length and the type of the average itself) and that can tell us more about the rhythm of the market and when the trend is continued or abandoned.

PS: price smoothing is added as a "reasonable compromise" to get a bit smoother (less signals) oscillator. As long as the smoothing is small, smoothed price is going to be very close to the price itself