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sub pedal & parallel looping

IDK where you are but OC-2s pop up here fairly often in the classifieds and they are on eBay too.

Also I don't believe anyone can tell you if you are going to phasing issues so I would guess it is better to have the NRM/INV switch and not need than not have it and need it. I can say that I have bought many pedals and combos of pedals thinking they were going to be the one, only to get rid of them eventually. So even if someone can verify that you won't have phasing issues with the 4 eyes and whatever octave pedal you get, you may not keep those pedals forever, therefore having the NRM/INV switch may make your parallel looper pedal a keeper forever.
 
willbassyeah said:
Just saying what is phasing issue?
Some pedals invert the signal. It doesn't make any difference to how it sounds, but when you blend it with the non-inverted one, they cancel each other out (because they're out of phase) and you lose all the bass frequencies.
The NRM/INV switch fixes that.