The silence is deafening, I may just have to try it myself then..
Lucky I bought some extras.. When I was a child hacking my computer, I would have looked at the price of that switch and become speechless. To be able to quickly compare what is and what was, is - priceless.
It's interesting, and annoying, but the capacitor I was using yesterday wasn't the exact value specified in the datasheet. I didn't notice any extra noise, except when connecting it to the source that I knew wasn't the right one. Now, with the correct values, I can hear extra artefacts - a very quiet ticking sound, no doubt of the electronics that's running.
This is closer to how I had it yesterday, but no difference. With my ears up against the speakers, it's there, ever so quiet - tick tick tick tick. 15cm away and it's too quiet to hear, but, I may have to get some more capacitors to test which are closer to the one I used before (I only had the one).
Bloody analogue electronics.
I just bet Sanyo were saying the same thing and came up with the idea of introducing slightly louder white noise to hide it.