I haven't used this orc myself, but I've been looking at it during the
conversations in the list.

so the only argument for the deltapi is delay time. Feeding the audio
signal into this would make the delay dependant on the amplitude of
the audio signal. however, sedning it directly would probably not
sound that great. However a well planned manipulation of the signal
could make some really interesting phase distortion effects.
It seems like the orc is saving an old version of the audio signal,
and subtracting it from the current signal value. This could be
considered like a rate of change parameter for the audio signal. The
slope variable seems to control how much that change should be taken
into effect. The duty cycle variable is probably like an initial delay
time from which the variations would occur (but again tied to the
value of the incoming audio.) So this way, the more dynamic bits of
audio would cause a larger delay resulting in a distortion of
different frequencies.

Am I on the right idea with this?