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Chapter 3 ES2 50
ES2 lter conguration
The Filter Conguration button lets you switch between a parallel and series lter routing. When
either is chosen, the entire circular lter element rotates, and the positions and direction of the
lter controls clearly indicate the signal ow. The button name also changes in each mode.
Series filter signal flow
Parallel filter signal flow
In the gure to the left, the lters are cabled in series. This means that the signal of all oscillators
(combined at the Oscillator Mix Triangle) passes through the rst lter, then this ltered signal
passes through Filter 2, if Filter Blend is set to 0, the middle position. The output signal of Filter 2
is then sent to the input of the dynamic stage (Amplier section).
In the gure to the right, the lters are cabled in parallel. If Filter Blend is set to 0, you’ll hear a
50/50 mix of the source signal, routed via Filter 1 and Filter 2. The output signals of the two lters
are then sent to the input of the dynamic stage. See Cross-fade between ES2 lters.
Cross-fade between ES2 lters
Filter Blend can have a signicant eect on the ES2 signal ow. Regardless of whether parallel
or series lter congurations are chosen, a Filter Blend setting of −1 results in only Filter 1 being
audible. A Filter Blend setting of +1 limits audibility to Filter 2. The gures illustrate the signal
ow between the Oscillator Mix stage (the Triangle) and the dynamic stage (the Amplier). The
signal ow through the lters and the lter overdrive circuit (the Drive parameter) are dependent
on the Filter Blend setting.
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Filter Blend: Series lter conguration information
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Use positive values for Filter Blend to partially bypass Filter 1.
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Use negative values for Filter Blend to partially bypass Filter 2.
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When zero or positive Filter Blend values are used, there is only one overdrive circuit for
both lters.
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Use of negative Filter Blend values introduces another overdrive circuit, which distorts the
output signal of the oscillator mix stage before it is fed into the rst lter.
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If Drive is set to 0, no distortion occurs.
Filter 1
Filter 1
Filter 1
Drive
Drive
Drive
Drive
Drive
Filter 1
Filter 1
Filter 2
Filter 2
Filter 2
Drive
Drive
Filter 2
Filter 2
+1:
–0,5:
+0,5:
–1:
0:
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Filter Blend: Parallel lter conguration information