class:: XLine summary:: Exponential line generator. related:: Classes/Line categories:: UGens>Envelopes Description:: Generates an exponential curve from the start value to the end value. Both the start and end values must be non-zero and have the same sign. classmethods:: method::ar, kr argument::start Starting value. argument::end Ending value. argument::dur Duration in seconds. argument::mul Output will be multiplied by this value. argument::add This value will be added to the output. argument::doneAction A doneAction to be evaluated when the line is completed. See link::Classes/Done:: for more detail. Examples:: code:: play({ SinOsc.ar(XLine.kr(200,17000,10),0,0.1) }); ::