Hammond SKX, Reference Manual

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Overdrive & Multi-Effects
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Drawbar Effects - Ring Modulation
“Ring modulation” is a signal-processing effect whereby two different frequencies are mixed together in such a way as
to eliminate, as much as possible, the individual frequencies themselves, leaving only the sum and the difference of the
two frequencies. In analog circuits, this is accomplished by arranging diodes in a circle or ring, giving rise to the term,
“ring modulator.” The result is a sound rich in overtones and typically having somewhat of a bell-like or metallic
quality. Because of this, the sound is sometimes called a “Klang tone.”
From the previous screen, touch the PAGE LEFT Touch Button repeatedly until the words, “EFFECT TYPE”
appear on the top line of the display. If “Ring Mod.” does not appear on the bottom line, turn the VALUE Rotary
Control until the Information Center Display looks like this
The words “Ring Mod” should be blinking.
From the above screen, touch the PAGE RIGHT Touch Button once. The Information Center Display should now
look like this:
The legend underneath the word “SRC” should be blinking.
SRC - Source
Because a Ring Modulator requires two frequencies, there needs to be some way to control the “ring” frequency, or the
frequency the sound produced by the playing keys will interface with. This Advanced Feature allows you to select
how the ring frequency will be controlled. The data chart below shows the options you may select.
Drawbar Ring Modulation Source Options
Description Function
MAN Uses the DRAWBAR EFFECT Rotary Control to control the ring frequency.
EXP Uses the Expression Pedal to control the ring frequency.
LFO Uses the inbuilt Low-Frequency Oscillator to control the ring frequency.
Turn the VALUE Rotary Control to make your selection.
HA<O> SKX
Owner’s Playing Guide