IMO not MACD  because that is just another way of visualizing MA crosses which lend themselves to trending not trading range markets (throw in Fast MA value, Slow MA value, Smoothing value of 1 as a MACD in any of our system charts). Most trading range systems are often based around oscillators. Money Flow might be an interesting one since it incorporates volume, but Stoch or RSI would also be possible. Trick would be for us to develop a filter that would say "OK stop using the trending systems and start using the range systems" and vice versa. Easy to see on a chart in hindsight but a challenge in real time. Problem is they call for exactly opposite behavior -- if in a trading range sell the highs and buy the lows, if trending buy the breakout highs and short the breakdown lows. So need the "Market/System type" filter first then maybe some confirming indicators -- tough to automate some of the better ones we see daily in action here from Matt, Dodger, ravun, rp and others -- divergences, trendline breaks, holding support, failing at resistance etc. Might not be able to automate fully -- might have to have auto-setup with manual confirm, but if something backtests well that would be great.