Roland MV-8000 Owner's Manual download pdf (Page 58)

Effect

Virtual VCF

This reproduces, virtually, the VCF (Voltage

Controlled Filter). The sounds from the VCO or input

from external sources are processed with a filter that

moves the cutoff frequency as needed, and creates

brightness (or hardness) in the tone and changes in

tone brightness over time. There is a mixer to set the

input level from each of the sound generators at the

input section of the VCF.

Mixer

OSC1 (Oscillator 1), OSC2 (Oscillator 2), Noise,

ExtIn, Ring M

Sets the input level to the VCF from each of the sound

generators. Mute unneeded sounds by setting them to

Value: 0–100

Type

Sets the type of filter used.

Curve

Sets the filter’s slope characteristics at the cutoff

frequency (-24 dB at one octave: steep; -12 dB at one

octave: shallow).

Value: -12 dB, -24 dB

Some analog synthesizers featured -12 dB/octave, -24

dB/octave, or other slopes.

Cutoff (Cutoff Frequency)

Sets the filter’s cutoff frequency. Set this closer to zero,

the cutoff frequency becomes lower; set closer to 100,

the cutoff frequency becomes higher.

This setting varies with the addition of changes from

the envelope, LFO, and other changes.

Value: 0–100

Reso (Resonance)

Sets the filter’s resonance level. Raising the setting

increases resonance near the cutoff frequency, giving

the sound a special characteristic.

Value: 0–100

If the resonance value is raised to much, extreme oscillation

can arise. Take care not to allow this sound to damage your

ears or your playback equipment. To stop this oscillation

immediately, press EFFECTS PROCESSOR [On/Off].

Envelope

Depth (Envelope Depth)

Sets the depth of the Filter Envelope (the function of

changing the filter’s frequency characteristics over

time).

Value: -100–+100

A (Attack Time)

The elapsed time starting at the point Trigger In is

switched “On” to the point at which the cutoff

frequency reaches the peak value.

Value: 0–100

D (Decay Time)

The elapsed time from the point at which the cutoff

frequency reaches the peak value until reaching to the

sustain level (next item).

Value: 0–100

S (Sustain Level)

The level of the cutoff frequency after the decay time

(previous item) is passed and until Trigger In is

switched “Off.”

Value: 0–100

R (Release Time)

The elapsed time from when Trigger In is switched

“Off” until the cutoff frequency return to the original

(pre-attack) value.

These are the filter envelope settings. Select the contour

through the attack, decay, sustain, and release, and set the

degree of effect with the envelope depth. If a negative value

is selected for the envelope depth, the envelope shape is

inverted.

Value: 0–100

Value

Explanation

LPF

(Low pass filter)

Passes frequencies below the cut off

frequency.

BPF

(Band pass filter)

Passes frequencies near the cut off fre-

quency.

HPF

(High pass filter)

Passes frequencies above the cut off

frequency.

BEF

(Band eliminate

filter)

Passes frequencies other than those

near the cut off frequency.

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Roland MV-8000 Owner's Manual Page 58

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