Must be!
It took me a while, as I kept screwing up, but I finally got that circuit working! There's not a whole lot of gain on it, so I increased the feedback resistor, using a 100kOhm pot, and then the output of that goes into a TL074 where it gets amped again. However, there seems to be more noise than there should be. It's really pretty noisy.
Where would I start to look to lower the noise?
Other than that, it works pretty well!
I'm going to try to build the 5534 again, thinking that might be less noise, but unbalanced.