I think I know what they're talking about but I'm not sure of the terminology for this or very familiar with the subject so correct me if I'm completely wrong on any of this to those that are more familiar with the process. Sometimes older masters can't be read because the tape is stuck with itself and it can't be used at all, so the solution I've heard they used for music elements is putting the tape in an oven to loosen it. It seems to work pretty well most of the time but unless we're taking Mike too literally here, it seems the distortion was a defect originated from baking the tape. This technique doesn't always make the tapes better tho with little to no detractors, I've heard in the FSM forums that Vertigo's music tapes were put through that same process and as a result the tape disintegrated because of how sensitive it was but I have never been able to found the source behind that claim so I'm not sure if it's legit. Again if we misinterpreted what Mike said and it was just a figure of speech and it has nothing to do with that process then it's probably the result of tape being 50 years old and in probably less then ideal storage conditions.