The recent addition of a fourth H9 has added immensely to the possible order and combination of effects, or allows the use of one unit as a looper and three as effects, etc. Including the multi-fx algorithms like ModEchoVerb and the delays with modulation, pitch shift, or reverb, the possibilities are nearly limitless.
Here's an example of quad H9s combining Octave>Wah>Delay>Reverb
