Alesis DM Pro Reference Manual page 85

Filter, Modulation Wheel to Filter and Filter Envelope to Filter.
P1 The CUTOFF FREQUENCY Parameter
This Parameter sets the basic brightness of the Filter. Like all Filter Parameters, the
Cutoff Frequency Parameter can be overridden by other Filter Parameters, but this is
generally the place to start when constructing a Filter setting.
To set the Cutoff Frequency for an individual Sound, move the cursor beneath the
Parameter Value and then turn the Value encoder:
SND1:FILTER
Frequency: 7 0
Note that a Value of 99 completely opens the Filter, essentially negating it. Similarly,
a Value of 00 completely closes the Filter, cutting
silencing the Sound.
However, as mentioned above, the other Filter Parameters can also raise and lower
the Filter, so these extreme settings are not necessarily as outlandish as they may
seem when used in conjunction with other Filter Parameters. For example, if you
plan to use the Filter Envelope, it is a good idea to keep the Cutoff Frequency very
low or even at 00 in order to give the Filter Envelope maximum operating range.
P2 The VELOCITY TO FILTER Parameter
This Parameter allows incoming Velocity from either a Trigger or MIDI to
dynamically modulate the Filter Frequency either up or down. Positive Values cause
incoming Velocities to open the Filter (raise the Cutoff Frequency), whereas negative
Values cause incoming Velocities to close the Filter (lower the Cutoff Frequency). The
higher the incoming Velocity (the harder the hit), the greater the effect on the Filter.
To set the amount that Velocity will modulate the Filter, move the cursor beneath the
Parameter Value and then turn the Value encoder:
SND1:FILTER
VELO>FILT: 1 0
DM P R M
RO EFERENCE
P1
P2
ANUAL
Programming Drums
all
frequencies and effectively
8 5