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178
E-MU Systems
Programming Basics
Clock Modulation
You might use the LFOs to add a slight bit of animation to the sound by
routing the LFO to control the filter. For this effect, set the LFO “amount”
low for a subtle effect.
When a PatchCord amount is a negative value, the LFO shape is inverted.
For example, inverting the sawtooth wave produces a wave that increases
abruptly, then smoothly glides down.
(Since the inverted sawtooth wave is
now negative, adding DC with a cord amount of +100 will make it positive again.
See page 186 for information on how to use a DC Cord.)
Clock
Modulation
You can use the Master Clock as a modulation source, to trigger the Filter or
Auxiliary Envelope generators, trigger Sample Start, synchronize the LFOs,
or directly as a square wave modulation source. The Clock source is
available in eight divisions (octal whole note, quad whole note, double
whole note, whole note, half note, quarter note, eighth note, sixteenth
note). You can use the different rates separately or in conjunction to create
complex “synchro-sonic” rhythm patterns. You can also use a MIDI Clock
as the Master Clock to synchronize to an external MIDI device such as a
drum machine or sequencer.
(See Master Tempo in the Global menu.)
Envelopes are triggered
on the positive going edge of the
clock. LFOs are triggered on the
negative going edge of the clock.
Clocks are routed exactly like the other modulations sources using the
PatchCords. The PatchCord Amount MUST be positive (+) for the clock to
pass. By modulating the PatchCord Amount, you can route the divided
clocks using real-time controllers or other modulation sources.
When an LFO is triggered by a clock, the LFO wave resets to zero every time
the clock wave goes low. If the LFO rate is close to the clock rate, the LFO
virtually synchronizes with the clock. If the two rates are far apart, the
waveform of the LFO will be mildly or radically altered.
The tempo of the master
clock is set in the Global menu.
LFO Trigger
causes the LFO to reset each time the clock waveform goes low.
I n v e r t e d S a w t o o t h
N e g a t i v e A m o u n t
+
-
S a w t o o t h
Clock
LFO Wave
Triggered LFO
Содержание XL-7 Command Station
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