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In practice, it might be better to say that you are reducing all current paths to the node, making it high impedance, since even "off" switches will leak some current.
The reason to make that distinction is that as a high impedance node, the smallest amount of leakage charge from anywhere will...
Re: Wire---frequency
It's not so much the wire as what's near it.
Starting at about maybe 1 megahertz, you'll start to couple signals into adjacent wires. At moderately low powers, like signals in computers, this may be negligible, but at extremely high powers as in a radio transmitter...
sd card interface in sound circuit
Here is project that plays multiple sounds on buttonpresses:
**broken link removed**
It plays prerecorded WAV files off an SD card. It's not a kit, but the circuit and code are available.
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