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Indeed, it might be nice to purpose build something like this. I think you've got us interested!
So many questions though...
I imagine you might have a low impedance output driver stage capable of 3.5 V peak to peak plus? How is the dc offset?
Any hassles using USB with an 'on air' pc? Is current consumption reasonable via USB or are you using an external source?
What is the spectral purity like? Regulators and noise?
It need extarnal supply, because high speed high current amplifier was used, DC offset not present, some kind of DC servo.
Possible to use only USB supply, this is next thing to do.
Purity spectral best possible, avery part is low noise.