Roland BK-7m Owner's Manual page 78

Backing Module BK-7m
Menu options
ative values reduce all velocity values by the same
amount (leaving differences between notes intact),
while positive settings increase all velocity values.
Parameter Setting
Velocity -127~+127
Cut Off
This filter parameter allows you to make the selected
sound darker or brighter. Positive settings mean that
more overtones are allowed to pass, so that the
sound becomes brighter. The further this value is set
in the negative direction, the fewer overtones will be
allowed to pass and the sound will become softer
(darker).
Characteristics of a low-pass filter
Setting
Parameter Setting
Cut Off -127~+127
NOTE
For some sounds, positive (+) "Cut Off" settings will cause
no noticeable change because the preprogrammed "Cut
Off" parameter is already set to its maximum value.
Resonance
This is a parameter one invariably associates with a
synthesizer. When the "Resonance" value is increased,
the overtones in the area of the cutoff frequency will
be emphasized, creating a sound with a strong char-
acter.
Parameter Setting
Resonance -127~+127
NOTE
For some sounds, negative (–) "Resonance" settings may
produce no noticeable change because the resonance is
already set to the minimum value.
The following parameters allow you to set the
sound's "envelope". The envelope parameters affect
both the volume (TVA) and the filter (TVF). The cutoff
frequency will rise as the envelope rises and fall as
the envelope falls.
Attack (T)
This parameter adjusts the onset of the sound. Nega-
tive values speed up the attack, so that the sound
becomes more aggressive.
Parameter Setting
Attack -127~+127
78
Frequency
Cutoff frequency
Decay (T)
This parameter adjusts the time over which the
sound's volume and cutoff frequency fall from the
highest point of the attack down to the sustain level.
Parameter Setting
Decay -127~+127
NOTE
Percussive sounds usually have a sustain level of "0". Piano
and guitar sounds are in this category. Holding the keys for
a long time will have little effect on the duration of the
notes you are playing, even if you select a high value here.
Release (T)
This parameter adjusts the time over which the sound
will decay after the note is released until it is no
longer heard. The cutoff frequency will also fall
according to this setting.
Parameter Setting
Release -127~+127
NOTE
Some sounds already contain natural (sampled) vibrato
whose depth or speed cannot be changed.
Use the following three parameters if you think the
instrument in question has too much (or could use a
little more) vibrato.
Vibrato Rate (T)
This parameter adjusts the speed of the pitch modu-
lation. Positive (+) settings make the preset pitch
modulation faster, and negative (–) settings make it
slower.
Parameter Setting
Vibrato Rate -127~+127
Vibrato Depth (T)
This parameter adjusts the intensity of the pitch
modulation. Positive (+) settings mean that the
"wobble" becomes more prominent, while negative
(–) settings make it shallower.
Parameter Setting
Vibrato Depth -127~+127
Vibrato Delay (T)
This parameter adjusts the time required for the
vibrato effect to begin. Positive (+) settings increase
the time before vibrato will begin and negative set-
tings (–) shorten the time.
Parameter Setting
Vibrato Delay -127~+127