In arbitrary bit shape mode, leading and trailing edge are not available as
adjustable parameters since they are a part of the transition definition. But
the transition time does vary with changing frequency in this case.
The benefit of describing the transition from one bit value to the following
one is that the value of the previous bit does have influence the current bit.
This allows the emulation of various real world effects and distortions like
capacitive loads, asymmetric delay or crossing point deviations, as well as
duty-cycle distortions or arbitrary transition times. The use cases are almost
unlimited, as long as the required signal transitions can be expressed by an
arbitrary waveform and do not depend on anything else than the value of the
previous and current bit.
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