Filter; Cutoff Freq (Cutoff Frequency); Resonance - Roland SC-8820 Owner's Manual

Parameters

Filter

By modifying the filter settings, you can control the timbre (tone) of the sound. The
type of filters in the SC-8820 are called Low Pass Filters, and allow only frequencies
lower than a specified frequency to pass. This frequency is called the Cutoff Frequen-
cy. By modifying the setting of the Cutoff Frequency you can make the sound bright-
er or darker. The Cutoff Frequency can change over time, controlled by the envelope.
By adjusting the filter and envelope settings, you can create sounds that have move-
ment and expression.
fig.6-3e
Higher frequencies
Lower frequencies

Cutoff Freq (Cutoff Frequency)

Positive settings of Cutoff Freq will raise the cutoff frequency. Negative settings will
lower the cutoff frequency. As you set this value higher in the positive direction,
more overtones will be allowed to pass, and the sound will become harder (brighter).
The further this value is set in the negative direction, the fewer overtones will be al-
lowed to pass, and the sound will become softer (darker).
fig.6-4e
Low pass filter characteristics
Level
Cutoff frequency

Resonance

When the Resonance value is increased, the overtones in the area of the cutoff fre-
quency will be emphasized, creating a sound with a strong character.
fig.6-5e
Level
Cutoff frequency
Low
34
Low
pass
filter
Frequency
Frequency
High
Resonance
Cutoff frequency
-64–0–+63
-64–0–+63
For some sounds, positive
(+) settings of Cutoff Freq
will cause no noticeable
change in the sound.
For some sounds, negative
(-) settings of Resonance
will cause no noticeable
change in the sound.