I have found phaser and chorus to reasonably subtle until some drive is applied. Even then, I wasn't that happy with results. For phaser chorus etc. I seem to get the best results with this.
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I was going to send my old Ross flanger to AnalogMan to see if it could be salvaged, but when I checked, he wasn't taking on such work. Anyone have any recommendations? (@Chucky Stiletti , you up for it?) I used to have a set of Ross schematics, but haven't seen them since we moved into this house (a good while back).
It quit working after a direct lightning strike at the last house.