> the analysis yields a good solution in Assembly, then it shouldn't
> be a difficult task to implement any other sweep after that (sweep
> up or down)

Using the NCO to emulate Audacity will work if you have the data

Personally, I might consider the PIC-DAC-VCO option, with a view
to a system that lets you enter just start/end voltages and time. A linear
to exponential converter circuit would need only triangle wave data.
The DAC need not be discrete, could be a basic binary-weighted one
using eg 5 or 6 output pins and a few resistors

I'd even have a go with a dsPIC33 that has an audio DAC. Capture
the Audacity wave with the ADC and store the data

Joe


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