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About Trigger Parameters
The D4 now offers five user controllable trigger parameters.
These are:
• VCURVE. This represents the velocity curve, or the sensitivity of the trigger
input. There are eight separate curve tables, 0 through 7. Using these
settings it is possible to adjust the D4s' triggers to accompany a wide variety
of playing styles, and to help compensate for sensitivity variances between
different brands of drum pads and triggers.
The lower the setting, the less sensitive the velocity curve and the higher the
setting, the more sensitive. For example, a pad using a setting of 7 will reach
a MIDI velocity of 127 with just a moderate strike. For a pad whose VCURVE
setting is 1, only a very hard hit would generate such a velocity.
For average type of play (striking pads with velocities ranging from very soft
to very hard) the default setting of 4 is ideal in achieving the full range of
sensitivity which corresponds to MIDI velocities of 1 through 127.
Note: Curve 0 is named "Unassigned". The function of this curve is explained
fully in section 5.2 "Trigger Velocity Section".
• XTALK. (Crosstalk). Sometimes hitting one pad will cause a nearby pad to
false trigger or "crosstalk". This is generally due to stand vibrations which can
affect the other pads. These vibrations send signals to the nearby pads which
can cause false triggering. The XTALK adjustment acts as a suppression
control.
A higher value adjustment equals greater suppression of the signal, a lower
value equals less suppression. Therefore, the higher the value setting, the
less likely the nearby pad (or drum) will trigger from stand or head vibrations.
This is how it works:
First, you strike a pad and the D4 triggers its sound. Shortly after this hit the
D4 receives a secondary, "softer" signal from a nearby pad. Before the D4
will play this softer signal, it will scan the other inputs to determine whether
this was a legitimate hit, or simply a vibration from a stand or head.
It does this by comparing the level of this soft signal with the threshold level
set in the XTALK parameter. If this secondary signal level is greater than the
allowable threshold level, the D4 will trigger its sound. If the signal is less
than the allowable threshold level, the D4 will ignore it.
By adjusting the crosstalk level to a higher value, you set a higher threshold
for the signal to exceed, and reduce the ability of a pad (drum) to crosstalk.
The following chart shows a scenario with a properly adjusted XTALK level.