User Manual

26 Filter 1 & 2 Dave Smith Instruments
Resonance: 0...127—Emphasizes a narrow band of frequencies around
the cutoff frequency. On Filter 1, high levels of resonance can cause the
lter to self oscillate.
Filter 2 does not self oscillate at the maximum resonance setting.
Filter Mode: LP, Notch, HP, BP—This knob selects Filter 2’s mode of
operation. It transitions smoothly from low-pass to notch to high-pass
operation, allowing a blending of these modes. Band-pass operation is
selected with the BP switch. Each lter mode has its own characteristic
sound and function. As noted previously:
• Low-pass: passes frequencies below the cutoff frequency
• Notch: removes frequencies in a notch centered around the cutoff frequency
• High-pass: passes frequencies above the cutoff frequency
• Bandpass: passes a band of frequencies centered around the cutoff frequency
On the front panel, band-pass mode is selectable only through the bp on/off
switch. However, you can actually smoothly transition between normal and band-pass
operation by choosing
F2-normal-bp as a modulation destination in the mod matrix.
Filter Routing: Series, Parallel—This knob selects a variable blend of
serial or parallel processing by Filters 1 and 2. In series, audio is passed
rst though Filter 1 then Filter 2. In parallel, audio is passed simultane-
ously through each lter individually.
Oscillator Split: Off, On—When enabled, this switch sends oscillators 1
& 2 to Filter 1 and oscillators 3 & 4 to Filter 2.
Boost: 0...127—(In the filter 1 tab of the display) This boosts the
output of Filter 1, making it possible to add makeup gain to the post-lter
signal level or even overdrive the lter output and add harmonic distortion.
Key Amount: 0...127—(In the filter 1 and filter 2 tabs of the display)
Sets the amount of modulation from the keyboard to the lter’s cutoff
frequency. In simple terms, setting a value here means that the higher the
note played on the keyboard, the more the lter opens. This is useful for
adding “brightness” to a sound as higher notes are played, which is typically
how acoustic instruments behave. A setting of 64 will step the lter in semi-
tone increments for each note, 32 would be quartertones, and so on.