analog wavetable?

[Plinio Andres Barraza]

I was wondering if anyone on this list knows of, has thought of, or better
yet, designed or built an analog oscillator that works like a digital
wavetable oscillator.  

I can't imagine how it would work except that one
could somehow design a complex envelope generator, and figure out a way to
make it repeat itself (the hard part) indefinitely.  Of cource, it would
also be nice if one could controll the time it takes to complete one
cycle, hence the frequency.

any ideas?

Plinio