FM / TRACK
3G
29 VCA 2 MOD BY ENV 2
This second-stage VCA is used to determine the final output of
the patch. As you can see, there is no Volume parameter for VCA2
like there is for VCA 1 . The volume of VCA2 is pre-set to be
O
because its output level is controlled exclusively by Envelope #2.
This function is concerned only with the amount of ENV2 affecting
the VCA's VOLUM E output. The actual settings of the envelope
are made in the ENV2 Sub-Page. VALUE range is from -63 to +G3.
A Value of
O
indicates that the envelope has no effect on the VCA
which results in no sound when the Keyboard is played. A setting
of +G3 is the maximum. Using negative Values invert the effect of
ENV2 on the VCA's VOLUME. A Value of -G3 is the maximum
inversion.
The FM
I
TRACK section involves the functions of two independent
modulation generators, listed here in the same Sub-Page.
FM
"FM",
which stands for Frequency Modulation, allows you to achieve
a form of special-effect modulation that is routed to the VCF
Frequency. Explained in more detail later, FM basically involves a
high-frequency modulation of the Filter to obtain tone colors not
possible with conventional LFO modulation.
"TRACK"
is the abbreviation for Tracking Generator which can be
described as a special-purpose function that permits the rescaling of
a control source. We'll cover the operation and use of TRACK in just
a moment.
Frequency Modulation, or FM, is a basic analog concept. The evolution of
Linear FM as a technique for sound synthesis has become possible in
recent years because of major breakthroughs in digital signal processing
and oscillator stability.
The fundamental idea of FM is that if you take two oscillators and modulate
one of them (called the Carrier) by the other (called the Modulator), a series
of new overtones or harmonics will be generated. This new harmonic
structure is related to the frequency (pitch) and the amplitude (loudness) of
the Modulator. If the frequency and amplitude of the Carrier is changed, yet
another set of harmonics is produced.
In the MATRIX-GR, DC01 is used to modulate the VCF. DC01 is the
Modulator and the VCF, although not actually an oscillator, is the Carrier. FM
in this case is best heard when "24 RESONANCE" is set to its maximum,
Matrix-GR Owner's Manual
