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PROGRAM mode: HD-1
PROGRAM > Filter
Filtering can make subtle or dramatic changes to the
oscillator's timbre. Each oscillator has two multimode
resonant filters, A and B, as well as a dedicated filter
envelope and keyboard tracking generator.
These pages let you control all aspects of the filters. Among
other things, you can:
3–1: Filter1
3–1a
3–1b
This page contains all of the basic settings for Oscillator 1's
Filter A and Filter B. For example, you can:
• Set up the filters to produce a single 12dB/oct filter, dual
12dB/oct filters in either serial or parallel routing, or a
single 24dB/oct filter.
• Set each of the two filters to Low Pass, High Pass, Band
Pass, or Band Reject modes.
• Set the cutoff, resonance, and input and output levels of
each filter, including modulation of resonance and output
level.
3–1a: Filter Routing
Filter Routing
Each oscillator has two filters, Filter A and Filter B. This
parameter controls whether one or both of the filters are
used, and if both are used, it controls how they are connected
to each other.
Single. This uses only Filter A as a single 2-pole,
12dB/octave filter (6dB for Band Pass and Band Reject).
When this option is selected, the controls for Filter B will be
grayed out.
Serial. This uses both Filter A and Filter B. The oscillator
first goes through Filter A, and then the output of Filter A is
processed through Filter B.
62
[Single, Serial, Parallel,
24dB (4-Pole)]
• Make basic settings for each oscillator's filters, including
routing, modes, cutoff, resonance, etc.
• Set up filter modulation, including keyboard tracking,
the filter envelope, LFO modulation, and AMS control.
Note that when the Oscillator Mode is set to Single, only
Oscillator 1's filters are active; the pages for Oscillator 2's
filters will be grayed out.
Parallel. This also uses both Filter A and Filter B. The
oscillator feeds both filters directly, and the outputs of the
two filters are then summed together.
24dB (4-Pole). This merges both filters to create a single 4-
pole, 24dB/octave filter (12dB for Band Pass and Band
Reject). In comparison to Single, this option produces a
sharper roll-off beyond the cutoff frequency, as well as a
slightly more delicate resonance. Many classic analog synths
used this general type of filter.
When 24dB (4-Pole) is selected, only the controls for Filter
A are active; the controls for Filter B will be grayed out.
3–1PMC
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