Oberheim Matrix-12 User Manual

LFOX
Suitable trigger sources for this purpose can be a footswitch or any trigger source
- such as a drum machine or a sequencer-that provides a DC pulse of at least 20
ms. (milliseconds) in width and an amplitude of +1 to +10 volts.
The External Trigger modes operate the same as their Keyboard Trigger
counterparts. In other words, External Triggers can either be SINGLE or MULTI,
depending on which one is selected.
EXTRIG "External Trigger" - When selected, the Envelope will
start its cycle only when it receives a trigger signal from an
external source plugged into the TRIGGER IN jack on the
MATRIX-12's back panel.
GATED "Gated External Trigger" - When this is selected, the
external trigger source will trigger the Envelope only when
the Envelope is gated. In other words, the Envelope will only
recognize a trigger from the external source when keys are
played. If this is not selected, the Envelope will be triggered
each time it recieves an external trigger whether or not keys
are being played.
LFO Triggers
The Envelopes can also be triggered by a third source, the LFOs. This option can
be used at the same time with Keyboard but not External Triggering. This
parameter allows you to use an LFO or VIB (the MATRIX-12's Vibrato LFO) as a
trigger source in order to synchronize the Envelopes1 cycles with an LFO's cycle.
The Envelopes normally operate with no LFO triggering.
LFOTRIG When this is selected, the Envelope will now be triggered by
an LFO. Knob #5 seledes which of the MATRIX-12's five
LFOs or VIB will be used to trigger the Envelope. Since most
of the LFO's waveforms are periodic (continuous and
cyclical), exactly what point on the LFO's wave that does the
triggering must be determined. This is accomplished in the
LFO Primary Page RETRIG. (See Pages 135 and 137.)
GATED "Gated LFO Trigger" When this is selected, the selected
LFO or VIB will trigger the Envelope only when the Envelope
is Gated. If this is not selected, the Envelope will be
continually triggered because the LFO is always running.
The abbreviation "LFOH stands for "Low Frequency Oscillator". An LFO is, in most
respects, similar to a regular oscillator except that its pitch (frequency) range is
below the threshold of normal human hearing. Thus, its primary application is
being used as a Modulation Source.
The five LFOs in the MATRIX-12 each contain seven types of waveforms to be
used for modulation. The first four are called "periodic" (TRIANGLE, UP SA W,
DOWN SA W and SQUARE} because they repeat in even patterns or cycles.
The next two are called -aperiodic" (RANDOMand NOISE) because they are
basically disorderly patterns that do not repeat with any regularity. The seventh
choice "SAMPLE" is used to sample any one of the other Modulation Sources
and uses the result of this sampling as its waveform.
132 Matrix-12 Owner's Manual

Oberheim Matrix-12 Specifications

General

Brand	Oberheim
Model	Matrix-12
Category	Synthesizer
Language	English