Attenuate -10db output
What you're asking for a is device that is basically Audio Engineering
101 -- a simple (hah!) attenuator.
Rather than explain how to do this -- it is not _mathematically_ difficut --
why don't you do some research into attenuator design? There are several
design factors that might not be obvious:
1. What is the load the device driving the attenuator sees?
2. What is the minimum load impedance the device can see and still have its
spec'd output, distortion, etc?
2. How does the output impedance of the device interact with the
attenuation?
4. What is the source impedance the load sees?
This is stuff you need to understand to improve your engineering skills. I
urge you to get some literature on basic design and study it.
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