[sdiy] Vector-based ADC/DAC?

[Jay]

I guess this is sort of off-topic, but have any of you ever heard of this
being attempted? I've had the idea in my head for a few years.

It would be basically consist of using a high speed ADC to convert audio
vector curves, sort of an EPS file for sound recordings. Then using what I
can best describe as a "digitally voltage-controlled high speed variable
slope analog envelope generator" as a sort of DAC. Excuse me if my idiocy in
this field is showing, but wouldn't that then eliminate all quantization
that is inherent in digital recordings?

Is this even possible in real time? Is it possible as a DIY project?

Just thinking out loud...