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Chapter 12 Retro Synth 226
Retro Synth lter controls
Retro Synth features a exible lter that can operate as a lowpass, highpass, bandpass, band
reject, or peak lter. The lter can subtly, or dramatically, aect the basic tone sent from
the oscillators.
Filter use is straightforward. Choose a lter type and set a lter slope (if applicable). Adjust the
lter cuto and resonance controls to sculpt the sound. You can also control the lter cuto and
resonance controls while playing—either manually or by using keyboard position, an envelope,
or the LFO to modulate these lter controls automatically. Real-time changes to lter cuto and
resonance can make your performance much more dynamic and interesting. You can do this
with MIDI keyboard controllers and with the other lter section controls. See Use Retro Synth
modulation and Retro Synth global and controller settings.
On/off button
Key (Follow) slider
Filter FM knob LFO knob Filter Env(elope) knob
Filter Type pop-up menu
Cutoff/Resonance control
Filter parameters
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On/o button: Turns the lter section on or o. You will normally have the lter enabled
(indicated by the lit button at the top left of the lter section). Disable the lter when
adjusting other sound controls because this makes it easier to hear changes.
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Filter Type pop-up menu: Choose a lter type from the menu. There are four lowpass lters with
dierent slopes, a highpass, bandpass, band reject, and peak lter available.
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LP (lowpass): Allows frequencies that fall below the cuto frequency to pass. You can choose
one of four slopes that change the tonal characteristics of the lter, making it sound brighter,
mellow, thinner, or fuller—particularly in the bass end of the sound.
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HP (highpass): Allows frequencies above the cuto frequency to pass. The slope of the
highpass lter is xed at 12 dB/octave.
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BP (bandpass): The frequency band directly surrounding the cuto frequency is allowed to
pass. All other frequencies are cut. The Resonance control sets the width of the frequency
band. Bandpass is a two-pole lter with a slope of 6 dB/octave on each side of the band’s
center frequency.
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BR (band reject): The frequency band directly surrounding the cuto frequency is rejected,
but frequencies outside the band can pass. The Resonance control sets the width of the
rejected frequency band.
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Peak: A peak lter allows the level in a frequency band to be increased. The center of
the frequency band is set with the Cuto control. The width of the band is set with the
Resonance control.