When using arbitrary bitshapes, the number of levels basically only
defines how many different level transitions can be defined. It is up
to the user how the output level is being defined for the arbitrary
bitshapes. The High and Low Level that is configured on the outputs
will only define the levels that will be achieved for minimum and
maximum DAC settings (+/-8191). The paticular output level is
defined by the used DAC value(s) in the arb bitshape and can be
distributed between High and Low Level as required by the
application.