Interesting. I thought "conventional wisdom" was to put compression after these kinds of pedals. I'll have to give this a try.
Actually 'conventional wisdom' says compression before octave is a good idea add it helps with tracking.
Not all compressors will have this effect though. I tested a bunch of pedals before the Octabvre and so far only the Diamond Compressor and Blueberry manage to produce all this sub bass out of nowhere!