Trapezoidal Function Generator With Constant Attack and Release The updown~ object is driven by a ramp from 0 - 1 or 1 - 0. It generates a trapezoidal function where the attack and release times are independent of the speed of the input ramp, unlike trapezoid~ where start and end times are specified as a proportion of the total input ramp cycle and thus will vary with the speed of the input ramp.

Note that the up phase of the updown~ object's output occurs after the reset of a phasor or a zero-to-non-zero transition, whether the input ramp moves up or down. The down phase of the output occurs in the time before a reset (or the end of the ramp) is expected to occur. Cycling '74 MSP MSP Functions Phasor Input Drive an updown~ object with a signal that ramps from 0 to 1 or 1 to 0. Phasor Input TEXT_HERE Trapezoidal Output The updown~ signal ramp that goes from 0 to the value specified by the level attribute and back to 0. TEXT_HERE TEXT_HERE Phasor Input The updown~ object produces a trapezoidal output in response to a signal ramp from 0 - 1 or 1 - 0. Down (Release) Time Sets the time of the output ramp descending from the maximum value to 0 in milliseconds Level Sets the maximum value of the trapezoidal function Up (Attack) Time Sets the time of the output ramp ascending from 0 the maximum value in milliseconds