Thanks again. I think that I made most of the changes that you suggested, including changing the op-amp. I hope this simple design will do the trick. I was comparing different op amps at digikey, and I was unable to find a search parameter that would tell me if the op amp handled capacitive loads. Is there a method other than pouring over tens of datasheets to get that info? In addition to the MC34071, I found the TS922 and LM7321 op-amps, which are rail-to-rail op-amps, would these work? Not that I would change away from the MC34071 in this project, it would seem to be perfect, cheap and effective.
I am back to trying to figure out R1, why should it be 200 ohms now instead of the 220 ohms in your original mod4? I am further trying to figure out how to go from base voltage to frequency modulation. I recognize that the CE capacitance changes with the base voltage as the audio signal enters Q2, but how much does it change? Where would I find that information? The 2n3904 datasheet talks about capacitance as a function of reverse bias (is this reverse bias?), but we are taking about tenths of picoFarads, is that enough? What is the equation that turns that capacitance into frequency in this circuit?
Audioguru, thanks again for your patience. Should you ever need to know something about biochemistry please don't hesitate to ask.