Alesis D4 Quick Setup Guide

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The D4 has twelve
trigger
inputs
designed
to
accommodate
the
most
widely
used
drum
pads
and other triggering
sources.
It's
triggering
mechanism is an advanced
signal to midi converter
which
incorporates
five user controllable parameters.
Trigger
parameters
are independent for
each of the twelve inputs, and
the set
up is global
for all drumsets.
The
five
types of user controlled parameters are:
1. VCURVE. There are
eight separate curve tables,
0 through
7
which represent
the velocity curve, or
sensitivity
of the trigger
input. Curves 1-3 have the least amount
of sensitivity;
curve
4
has the median, or
"average
type
of play"
sensitivity; and
curves 5-7
are
the
most
sensitive. Curve 0 is
"Unassigned".
This is a
special situation
parameter
which is fully
explained
in section 5.2 of the D4 Reference Manual.
2. XTALK. The
crosstalk parameter is
the
trigger suppression
level adjustment. It
is used to control
interaction problems
between
pads
or
drums. Crosstalk
problems
can occur when
two or more pads are mounted
on
a single stand or rack.
3.
DCAY. This
represents
the
signal decay time and
threshold
of the
D4's
trigger inputs. In other words,
DCAY
controls
the
amount of
time between once
a pad
has been
struck
and
triggers,
to when
it
will trigger
again from another hit.
When
properly
adjusted, this
parameter
defeats
"double
triggering
"
by
allowing
the
D4 to
determine
which
signals
are actual
hits, and which
are
secondary decay signals.
4. NOISE. The NOISE parameter allows you to control the
noise floor,
or the signal
level
threshold
that an
exterior
vibration or sound
must
exceed before
it will
trigger
a
drum
sound.
This is used mostly in situations where the stage
volume and vibrations
are
strong enough to
"rattle"
the
drum
hardware
to such
a point that the D4
"thinks"
these
vibrations are
actual hits.
5. GAIN.
This is the signal strength that the transducer
is
sending to
the triggers in the
D4, It's adjustment is very
similar
to that of a tape recorder's
VU meter.
With
the
gain
threshold set too
low, soft
hits may never
be
recognized.

Alesis D4 Specifications

General

Type	Drum Sound Module
Polyphony	16 voices
Trigger Inputs	12
MIDI	In, Out, Thru
Outputs	Headphone
Dimensions	19"
Effects	Reverb
Inputs	Trigger inputs
Display	LED
Power Supply	9V AC
Sounds	500