Steinberg HALION4 Mode D'emploi page 206

Two MIDI note events combined by an AND operation can never turn TRUE. For
example, the expressions "Note-on AND Note-off", or "Note-on AND Key up", or
"Note-off AND Key up" can never be TRUE.
When using several MegaTrig modules, the random value is the same across all
MegaTrig modules, if you select the Random option in the same row. By setting the
ranges so they do not overlap, you can switch randomly between the corresponding
layers.
Trigger Options
In addition to the expressions, you can specify the Trigger options.
The following options are available:
Option
New Notes
Held Note
Fixed Note
Note-Off Velocity
Below the Trigger options, the parameters to control the velocity of note-off samples
are located. This includes any sample selection through velocity mapping of the note-
off samples. The velocity may also have an effect on the level of the note-off samples,
as programmed in the zone.
The following parameters are available:
Option
Source
Velocity Amount
Decay Time
Decay Curve
Description
When the expression is TRUE, only new notes trigger the zones.
When the expression is TRUE, the currently held notes and any new
notes trigger the zones.
When the expression is TRUE, a single note is sent.
When Fixed Note is selected, the Note and Velocity parameters
become available. Use them to determine the note to be sent.
For example, to trigger the pedal noise of a grand piano, select the
condition Sustain On and set Trigger to Fixed Note. You can adjust the
note and velocity of the fixed note that is triggered. The Held Notes and
New Notes options trigger the notes as you played them on the
keyboard.
Description
Here, you can select if the velocity that is sent to the release
samples is taken from the note-on or the note-off event.
Allows you to adjust how much the selected option affects the
velocity of the note-off sample. This includes any sample selection
through the velocity mapping of the release samples.
Note that the velocity may also have an effect on the volume of the
sample, as programmed in the zone.
Depending on the time you set, the velocity of the note-off sample is
reduced the longer you hold a key.
Sets the curvature of the note-off velocity decay. Use positive
values for an outward shaped curve and negative values for an
inward shaped curve. Without changing the overall decay time, an
outward shaped curve reduces the note-off velocity faster and an
inward shaped curve reduces it slower.
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MIDI Modules Reference
MegaTrig