When drawing off battery supply the AC cord shouldn't be an issue (it's out of circuit isn't it?). However as PC says, the DC umbillical cords are definitely in circuit & would affect sonic signature.
I certainly don't think so, but I never tried anything other than the stock cords when I had my battery powered Rowland Model Sixes. However, I did notice a big improvement when I switched out the stock Cardas umbilical cords on my Rowland Model Twelves and Synergy with FIM Gold custom-made umbilical cords.
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