I couldn't find this posted on our forum so here is the Volatility Adjusted Stochastic for MT4 coded by Mladen.

As explained by Mladen.
In the more volatile periods this Stochastic is calculating shorter period stochastic in order to adapt quicker to the market and in times of low volatility it calculates longer stochastic periods. The adapting is applied to the main calculation only (it is not applied to signal line nor to stochastic smoothing (slowing))

In this example the upper is the regular stochastic and the lower is the volatility adjusted stochastic. At a first glance the difference is not big till we look at periods of sudden price changes (volatility) where difference can be significant