Here are two experimental indicators made by Mladen back in the TSD days which we have in our archives.

As explained by Mladen:
Adding these two simply as an experiment : one is Ehlers Sine Wave of RSI and the other is Ehlers Sine Wave of Stochastic. Some toys to see if Sine Wave can be used on some other "price" sources than price itself and what would be the result of the original John Ehlers' code in such cases (as a kind of estimation of sine wave indicator usefulness).