Key Follow - Roland JP-8080 Owner's Manual

Filter Type and Cutoff Frequency
When the filter is set to HPF, raising the cutoff frequency
will decrease the lower partials, making the sound brighter.
At the same time, the volume will also decrease. With high
settings of this parameter, some waveforms may produce
no sound at all.
Waveform (in the case of square wave)
level
frequency
When the filter is set to BPF, only the partials in the fre-
quency range specified by the cutoff frequency will be
allowed to pass. With high settings of this parameter, some
waveforms may produce no sound at all.
Waveform (in the case of square wave)
level
frequency
When the filter is set to LPF, lowering the cutoff frequency
will decrease the upper partials, making the sound more
mellow. At the same time, the volume will also decrease.
level
Waveform (in the case of square wave)
frequency
[RESONANCE]
As this slider is raised, the partials in the region of the cutoff
frequency will be emphasized, producing a distinctive
sound. If the slider is raised even further, a new sound will
be heard in addition to the sound of OSC 1 and OSC 2 (this
is known as oscillation), so normally you should avoid
excessively high settings of this parameter.
74
LPF BPF
level
frequency
Cutoff Frequency

[KEY FOLLOW]

This sets the Key Follow depth for the filter. When the filter
is a LPF, a central setting of Key Follow will cause the cutoff
frequency to remain fixed, and unaffected by the pitch of
the sound (i.e., the note that you played). This means that as
you play higher notes, there will be fewer partials in the
sound, making it increasingly more mellow in comparison
to lower notes. As the knob is rotated toward the right,
higher notes will have a correspondingly higher cutoff fre-
quency, allowing high notes to remain bright. Key Follow to
+32 (set while viewing the value in Edit Scope, p.64), the
sound will be the same brightness for all keys. Conversely,
when the knob is rotated toward the left of center, playing
higher notes will cause the cutoff frequency to become
lower, meaning that high notes will be even more mellow
than when the knob is in the center position.
level
low notes
frequency
1 2 3 4 5 6 7 8 9
partials
level
high notes
frequency
1 2 3 4 5 6 7 8
partials
Cutoff Frequency
(octave)
+2
0
–2
C2
HPF
level
low notes
1 2 3 4 5 6 7 8 9
partials
level
high notes
1 2 3 4 5 6 7 8
partials
+64 ( +200% ) +32 ( +100% )
–64 ( –100% )
C4 C6
frequency
frequency
0