Yes. What the audio guy meant was this:
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Now, it'll work, but I think the resistors are a little on the low side and likely to overload the source (total impedance is ~6KΩ), so I'd probably use 8.2K and 820Ω instead.
But I'd probably just go ahead and make a variable attenuator out of a stereo potentiometer (20K or 50KΩ), like so:
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That way you're not limited to a 20dB cut, unless you happen to need exactly that (you could actually determine the point equal to that, using an ohmmeter, and mark it on your dial). Using a miniature pot, the whole thing would fit nicely into an Altoids tin.