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Initializes the stroke DAC values to a constant value. If <value> is specified,
it must be an integer in the range 0 to 4095. If <value> is not given, it
defaults to 2047 (half the maximum).
If the <slope> is given, it specifies a tilted profile instead of a constant
one. This slope is the change in DAC value per pixel (NOT per sample). The
<slope> is a signed integer (i.e. slope can be positive or negative). If a slope
is given which causes the pixel's amplitude to reach 0 or 4095, the slope
changes sign at this pixel. The resulting pattern will look something like a
sawtooth.
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