[SloopJon]

> I'm not clear on how his blinding setup works

Search for "Blind Testing" on the first page: "I use a passive three-way switch to route the outputs from the three sources to a pair of headphones. ... without looking, I scramble the cables in each hand."

[gwern]

Can that possibly work? I would not expect cables to be perfectly indistinguishable (human touch is pretty sensitive), if only because of slight differences in tension/position/direction.