Moog MEMORYMOOG 345 Owner's And Service Manual page 37

Playing a scale on the keyboard with different amounts of keyboard voltage will show you audibly
just how changing the contro! voltage amount affects the FILTER. The intonation will change as you vary
the amount of voltage from the keyboard. Full keyboard voltage should yield a normal tempered scale.
Experiment with moving the CUTOFF control while you're playing the FILTER. Also, notice the
effect of running NOISE into the FILTER when the EMPHASIS amount is up to the point of oscillation
and the keyboard is controlling it: you get tuned NOISE.
CONTOUR AMOUNT
The CONTOUR AMOUNT control (8.4) is simply an attenuator for the control voltage generated by
the FILTER's CONTOUR GENERATOR (8.5), which gets applied to the CUTOFF frequency. Going back
to the basic patch we've been working with, you'll notice that it's possible to mimic the effect of the CUT-
OFF control with the CONTOUR AMOUNT control.
CONTOUR AMOUNT CONTROLS
OSCILL.ATORS VOLTAGE CONTROLLED FILTER
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ATTACK
FREQUENCY PULSE WIDTH (%)
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Lael veconolronet KEYBOARD RELEASE
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100 — —és& 200— —t2 — —— 12 i
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ies 10SEC we 20SEC awe 20SEC
KEYBOARD ATTACK DECAY RELEASE
aphids VOLTAGE CONTROLLED AMPLIFIER
HOLD A LOW NOTE. MOVE THE CONTOUR AMOUNT CONTROL. NOTICE THAT
WITH THESE SETTINGS, IT HAS THE SAME EFFECT AS THE CUTOFF CONTROL.
Changing the settings of the CONTOUR controls (8.5) will have a noticeable effect on this. To
understand what's happening, you have to understand what the CONTOUR GENERATORS do.
THE CONTOUR GENERATORS
As was explained in the section on the keyboard, when you play a note, a trigger signal is generated
by the keyboard which is channeled to the CONTOUR GENERATORS (8.5 and 9.0). It is this trigger
signal which tells the CONTOUR GENERATORS to start up. Once triggered, the CONTOUR GENER-
ATORS put out a dynamic control voltage — one that varies across time. When this voltage is applied to
the CUTOFF control of the FILTER, you get dynamic changes in timbre. When it's applied to the
VOLTAGE-CONTROLLED AMPLIFIER (9.0), you get dynamic changes in loudness.
KEY DEPRESSED KEY RELEASED
+ Sd
4 ATTACK | DECAY RELEASE |
TIME : TIME ; : TIME !
CUTOFF FREQUENCY
OR LOUDNESS
ae LEVEL!
~ LENGTH OF TIME
KEY IS HELD DOWN
TIME —
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