Wayne, Looks like a sweep sine analysis should give you a good idea about the frequency response. Make sure that you measure the input and output signals of the circuit; this way you can just compeir RMS values and get the frequency response.
Another method that you may want to look into is a broad band frequency response. Basically you send white noise to the circuit; then you acquire the input noise and the output noise; the you calculate the FFTs of this data and compair it; after some averaging you get the frequency response graph of your device. LabVIEW has a VI called Frequency Response Function that does a large part of the job; together with the "Frequency Analysis of a Filted Design.vi" example you can get a good idea on how to perform this test. I hope this helps. Regards, Juan Carlos N.I.
