Soundtoys PanMan - Manual (Page 12)

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At fast Attack settings (knob turned fully counter clockwise) the Rate and
Width Mod will go to their full mod setting instantaneously. As you turn up
and increase the Attack time it will take longer for the Rate and Width
modulation to reach their full amount, or width of modulation. This lets you
create smoother and slower changes in the rate and Width rather than the
immediate and abrupt changes that would occur with a very fast Attack
setting. As mentioned, this is dependent on the Threshold setting and how
far past the Threshold setting the signal goes.
It is important to keep in mind that the attack and sustain characteristics of
the input signal will directly affect how you will want to set the Attack time.
If the signal is staccato and quickly moves above and below the Threshold it
is likely that you will not hear the changes in the Rate or Width with slow
Attack time settings. The input signal will not be above the Threshold
setting long enough for the slower attack time to reach its full setting. It is
also very important that the sound stay above the Threshold setting for a
period equal to the Attack time for the modulation to respond.
Using various Attack times that are either very responsive to, or that are
slower than the changes of the input signal level, allows you to create a
wide variety of alterations in the pan effect. As we keep saying, there are
no right or wrong settings. It all depends on what kind of effect you are
trying to achieve. Experiment. There are a lot of neat possibilities.
Release
The Release knob works in a similar fashion the Attack knob but determines
how quickly or slowly the Rate or Width mod will return to their ‘normal’
settings once the input signal has dropped below the Threshold setting.
Release is based on time, in milliseconds, with a range from 0ms to
5000ms (5seconds).