"I certainly look forward to hearing the explanation."
There must have been a low pass filter on the output
of your DACs..
If you take the output of a voltage output DAC and
hook it to the input of a scope (which has electrostatic
deflection and has a very fast beam rate) you should
see only the initial value and the new value.. two
dots.
Audio DACs on sound cards always have anti-aliasing
low pass filters on them, which slowed down the
slew rate of the DAC output to where you could see
it on your scope.
