Oberheim Matrix-12 - VCF Modulation; KEYBD;LAG Modulation; LEVER Modulation

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passes, and are therefore most important.
As a rule-of-thumb, keep in mind that if both VCAs are set to 0 and no modulation
is used to control them, no sound will be heard from the MATRIX-12. On the other
hand, if both VCAs are set to any higher value than 0 - and if no modulation is
used -the sound of the Voices will always be heard even though no notes are
being played. This is due to the VCAs1 circuits being "open" by the various
Amount settings.
We will cover a number of useful modulation routings in the next section MATRIX
MODULATION. But for now, the most common set-up for the VCAs would be
VCA1 = 63, VCA 2 = 0 modulated by an Envelope. This is the traditional
synthesizer output setup.
VCF Modulation
The VCF is able to be modulated in much the same way as the VCOs, but of
course with different audible results. The MATRIX-12 provides a Page 2 of VCF
modulation parameters forthis purpose.
KEYBDILAG Modulation
These parameters are similar in operation to the KEYED and L^Gfound in the
VCO1 and 2 PAGE 2, although the results are different audibly.
KEYED When KEYED is selected, the VCF will follow the Keyboard
as different notes are played. This is called "the Keyboard
tracking the Filter". Playing high notes from the Keyboard
opens the Filter and low notes close the Filter. This allows
the VCF FREQ to keep its relative interval with the VCOs no
matter what keys are played. This is how we percieve the
frequency response of many acoustic instruments.
LAG When this is selected, LAG as set in the FM/LAG Page will
affect the VCF FREQ. Just like the VCOs sliding from note
to note, the Filter frequency will also exhibit a sliding effect
when LAG is selected in this Sub-Page.
LEVER Modulation
Similar to LEV 1 and VIB select for the VCOs, these parameters select LEVER 1
(ora MIDI Pitch Wheel) and LEVER2 (or a MIDI Vibrato Wheel) modulation to the
VCF Frequency.
LEV1
VIB
When underlined, permits you to route Bend Modulation to
the VCF Frequency so that if you're using LEVER1 to pitch
bend the VCOs, for example, the VCF will also change by a
corresponding amount. This keeps the Filter level relative to
the VCOs constant no matter what bend amount you are
using and the sound of the Patch remains the same. On the
other hand, LEVER1 can be used to open or close the Filter
whether it is bending the VCOs or not.
When selected, adds Vibrato modulation to the VCF,
normally controlled by LEVER2.
116 Matrix-12 Owner's Manual