Roland V-Drums TD-20X Owner's Manual page 103

Detecting trigger signal attenuation
(Retrigger Cancel)
Important if you are using acoustic drum triggers. Such
triggers can produce altered waveforms, which may also
cause inadvertent sounding at Point A in the following figure
(Retrigger).
fig.Retrigger.e
A
This occurs in particular at the decaying edge of the
waveform. Retrigger Cancel detects such distortion in and
prevents retriggering from occurring.
Retrig Cancel: 1–16
While repeatedly striking the pad, raise the "Retrig Cancel"
value until retriggering no longer occurs.
Although setting this to a high value prevents
retriggering, it then becomes easy for sounds to be
omitted when the drums played fast (roll etc.). Set this
to the lowest value possible while still ensuring that
there is no retriggering.
You can also eliminate this problem of retriggering with
the Mask Time setting. Mask Time does not detect
trigger signals if they occur within the specified amount
of time after the previous trigger signal was received.
Retrigger Cancel detects the attenuation of the trigger
signal level, and triggers the sound after internally
determining which trigger signals were actually
generated when the head was struck, while weeding
out the other false trigger signals that need not trigger a
sound.
Time
Chapter 8. Trigger Settings for Each Pad [TRIGGER]
Double triggering prevention (Mask Time)
When playing a kick trigger the beater can bounce back and
hit the head a second time immediately after the intended
note—with acoustic drums sometimes the beater stays
against the head—this causes a single hit to "double trigger"
(two sounds instead of one). The Mask Time setting helps to
prevent this. Once a pad has been hit, any additional trigger
signals occurring within the specified "Mask Time" (0–64
msec) will be ignored.
fig.MaskTime.e
Mask Time
Sound not produced
Mask Time: 0–64 (ms)
Adjust the "Mask Time" value while playing the pad.
When using a kick trigger, try to let the beater bounce back
and hit the head very quickly, then raise the "Mask Time"
value until there are no more sounds made by the beater
rebound.
When set to a high value, it will be difficult to play very
quickly. Set this to as low a value as you can.
If two or more sounds are being produced when you
strike the head just once, then adjust Retrig Cancel.
Time
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