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CHAPTER 5
Concept and Operation
 
MASTER CLOCK AND MIDI-
CLOCK
The VIRUS has a global clock generator which
can be used to synchronize the LFOs, the ar-
peggiators and the delay/reverb effects to a
common tempo. The internal clock generator
either works at a definable rate or slaves auto-
matically to any MIDI clock signal (e.g. from a
sequencer) arriving at the MIDI IN socket. Inter-
nal clock speed is controlled by the CLOCK
TEMPO parameter, which can be set to any val-
ue beween 63 und 190 BPM (Beats Per Minute).
Beats are displayed by a dedicated LED to the
immediate left of the UNDO button.
When the device is synchronized via MIDI
clock, the clock generator automatically ac-
cepts the speed dictated by the connected se-
quencer; the internal tempo setting is in this
case meaningless and thus disabled. The indi-
vidual sections of the VIRUS are synced up to
the clock generator at rhythmic intervals such
as 1/16, 1/4 and so forth. These values may be
assigned individually for every section. (AR-
PEGGIATOR CLOCK, CLOCK LFO 1, CLOCK
LFO 2, CLOCK LFO 3, DELAY CLOCK, see the
respective sections).
In SINGLE MODE, CLOCK TEMPO pertains to
the current SINGLE PROGRAM and is stored
along with it. In MULTI MODE, the CLOCK
TEMPO settings for the involved SINGLE PRO-
GRAMs are ignored. Instead, all involved SIN-
GLE PROGRAMs are controlled via the same
clock generator. Its  CLOCK TEMPO is saved in
the MULTI PROGRAM (as are the settings for
the global delay effect).
This feature lets you control the LFOs and ar-
peggiators of several MULTI PARTS in a com-
mon rhythmic context.
 
A small “c” will appear in the display when
the VIRUS is receiving MIDI Clock data. If you’re
sure you do NOT want the device to be syn-
chronized automatically to MIDI clock, set MIDI
CLOCK RX to Off (in the SYSTEM menu).) To
avoid confusion, please keep in mind that MIDI
Clock is not the same thing as MIDI Time Code.
The latter doesn’t deal with tempo at all but with
time-related  information structured in hours,
minutes, seconds, etc. which is of no benefit to
you in this context. 
 
HANDLING
PARAMETER SELECTION AND DATA 
ENTRY
In the VIRUS, we distinguished between two
types of parameters. On the one hand, it fea-
tures parameters that are essential in generat-
ing or synthesizing sounds, on the other hand it
has sound parameters and organizational pa-
rameters that are more of a peripheral nature.
This distinction is apparent in handling and op-
eration of the VIRUS: All essential sound pa-
rameters feature a dedicated knob or button so
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