I have them on my Rowland amp and pre-amp.....look nice - any sonic differences noticed - No
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Whether or not input shorting plugs make a difference will depend on the design of the preamp circuit involved. It is possible that a few models could pick up some noise though an un-shorted input and pass it to the input in use.
However, I'd think that a fairly rare situation and, to me, would indicate poor design choices for that one issue. It should not make a sonic difference with most equipment.
First let's not confuse caps, which simply surround the positive with the ground, with shorting plugs, which actually short the positive and ground. Cardas Caps are an example of the former and the old shorting plugs that came with Mac gear back in the day would be an example of the latter. I notice no difference with the former, but have had quite a good result from using shorting plugs, finding the overall noise architecture to be diminished and the fabric of the music to be clearer. YMMV.