[sdiy] Triangle wave DCOs?

[Aaron Lanterman]

I was reading through some of the traffic on DCOs (typified by ramp- 
with-microprocessor-controlled-reset type sawtooth cores), and was  
wondering... anyone know of any similar designs for triangle cores,  
where say a microprocessor is responsible for deciding when to switch  
the direction of the current going into the integrator? Basically,  
something like a Buchla VCO, but with a microprocessor decided when to  
trip the switch instead of a comparator.

I can't think of any particular advantage of such a scheme over a ramp- 
with-reset, but there might be something I'm overlooking.

- Aaron