Line-level signals (and loud headphone outputs) are in the ballpark of 1 Volt.
That shouldn't be a problem if you use the line-level input to your 700W amp. That'll work with a cheasy mp3 player, nd a ipod, and a legit stereo system without the worry of connecting grounds and accidentally frying something (which I did : (, very expensive mistake, I blew my 700w amp in my car) I think he's using it to eliminate switching noise with the digital pot. How would the cd4066 effectively isolate the audio signal? I've used them to switch crystals in and out of circuit on several 40 MHz transmitters (8.00+ MHz crystals). They are perfect for low level < 7.5VPP audio applIcations. 2 extra's for? Low current and about 125 ohms on resistance. Very simple to do and the CD4066 has 4 gates. (Eliminates "Pop's" or large dc transients from charged capacitors). A transmission gate or CD4066 would work very nicely providing you use coupling capacitors (10uF) and some load resistors (10K) to provide a discharge path for the coupling capacitors.
THere's many ways to solve your issue but you need to post a little more information before an educated response is possible. So I am using 10K Digipots with my Arduino. There are unique in that you can vary the output level with a DC pot. What impedance is the Line Level Signal? 600 ohms? Radio Shack makes a fine 600 - 600 ohm isolation transformer and many line outputs are 600 ohms.
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