Effect Block
A-56
MV-8800 Appendices
VCO (Virtual VCO + Ring)
This reproduces the VCO (Voltage Controlled Oscillator)
virtually. It comprises two oscillators, OSC1 and OSC2, a
noise generator, and ring modulator. Settings include those
for the waveforms that are the basis of synthesizer sounds
and pitch settings for the two oscillators.
OSC1 (Oscillator 1)
• Wave
Sets the waveform for the sound produced by OSC1.
• Width
Value: 0–100
Sets the pulse width when the “pulse wave” (Pul) is
selected for the OSC1 waveform. Increasing the value
narrows the pulse width. This has no effect if the
OSC1 waveform is not set to “pulse wave” (Pul).
fig.10-36
• PWM (Pulse Width Modulation)
Value: 0–100
When OSC1 Wave is set to “pulse wave” (Pul), this
set the depth which the LFO vibrates the pulse width.
This gives the characteristic cyclical change in tone.
Increasing the value deepens the effect. This is
effective only when the OSC1 waveform is set to
“pulse wave” (Pul).
•
When both OSC1 Pulse Width and OSC1 Pulse Width
Modulation settings are large, the periodic or cyclical
sound may become inaudible.
• Coarse/Fine
Coarse Value: -24–+24
Fine Value: -100–100
Sets the pitch of the sound from OSC1. With 0 as the
reference, coarse tuning adjusts the pitch in semitone
increments, fine tuning in cents (1/100 of a semitone).
• PitchKF (Pitch Key Follow)
Value: Off, On
This setting determines whether the pitch of Oscillator
1 (hereafter OSC1) changes according to the Note
Number in Common (On) or not (Off).
• X-Mod. (Cross Modulation)
Value: 0–100
Sets the depth of the OSC1 cross modulation effect
(the modulation of the OSC1 pitch by oscillation from
the OSC2). As the value is increased, the increased
overtones make the sound more powerful.
OSC2 (Oscillator 2)
These are the settings for OSC2. The effect of these
settings are the same as those in OSC1 (there is no
cross modulation included in OSC2).
Ring Mod. (Ring Modulator)
•
Src1 (Source 1)/Src2 (Source 2)
Value: OSC1, OSC2, Noise, ExtIn
You can select from two ring modulator inputs.
Besides the oscillators OSC1 and OSC2, “Noise” or
“ExtIn” (external input) may also be selected.
•
By multiplying the ring modulator’s two inputs each other,
you can create sounds that include numerous overtones
not found in either waveform. You can get metallic sounds
unrelated to any sense of harmony. To play the VCO’s
sounds (OSC1, OSC2, noise generator, and ring
modulator), raise the volume level of each in the VCF mixer
at the next stage. The synthesizer sounds are tuned to A4
(440.0 Hz). If you want to have A4 set to 442 Hz, set the
Fine reference setting of OSC1 and OSC2 above not to ±0,
but to +8.
Value
Explanation
Tri
Triangle wave. A clear sound with few overtones.
Pul Pulse wave. This sound varies depending on the
settings in the following parameters (Width, PWM).
Saw Sawtooth wave. A thick sound filled with
overtones.
Width=0
Width=50
Width=80
Width=100
MV-8800_a_e.book 56 ページ ２００６年１１月１０日 金曜日 午前１０時１９分
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