If I am not re-heating a piece, can I just use a single-speed instead of a ramp-hold system?
you need the ramps and holds to properly anneal it once it's done. it has to soak at 1050 for a couple hours then slowly cool to 960 and sit there for a minute then it has to slowly cool to room temp. this must be done over several hours.
you can do it other ways but it won't be as strong. it all comes down to the annealing.
ever have a pie that you just looked at wrong and it broke? this was because it wasn't properly annealed. there was "stress" in the glass and it finally let loose. when you work glass you tangle all the molecules. the annealing allows them to all relax and properly join together again.
the digital controller is really nice once you figure out how to program it. it's not that hard.