Thank you, Chrisstoff. In deed, this indicator looks very well. I did some manual backtests with Chaikin's Volatility indicator the last days.

I looked over some charts and it seems that it filters out more losing trades with lower volatility than the Bollinger Expansion...

Derk, is it possible to add this indicator to the trading rules: Buy or Sell only when volitility is > 0?

I think it's really worth to compare them ...