This is a good idea, but do note that you have to be a little careful:
there are lots of ways that the result can look random enough to fool
/dev/random's entropy count but be non-random enough to provide much
less entropy than you'd otherwise expect (e.g., 60Hz effects, etc.).
I think it's a workable approach, and I warmly recommend using a broad
diversity of entropy sources (including, e.g., soundcards), but you just
have to be careful to avoid some of the pitfalls.
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