User Manual
28
FILTER SECTION
The number and relative strengths of a sound’s harmonic
frequencies determine its tone color or timbre. The Subsequent
37 contains a lter for removing certain frequencies from audio
signals. Because ltering gives you control over an audio signal’s
harmonic content, it physically alters the waveform being ltered.
The Subsequent 37 has a classic Moog Lowpass Ladder Filter
with four selectable slopes. Lowpass lters pass all frequencies
up to a point called the cutoff frequency and gradually roll off,
or attenuate, frequencies above that point. You can change the
cutoff manually using the knob, or you can change it by applying
a signal from a control source such as an envelope or LFO.
Turning the cutoff all the way down closes the lter so that
nothing passes through it. Raising the cutoff opens the lter. As
you turn the CUTOFF knob clockwise from its lowest position,
rst you’ll hear only the audio signal’s lowest frequencies, and
then the timbre will grow gradually brighter. The lter envelope,
in combination with the CUTOFF knob’s setting, is the lter’s
primary control source.
Another characteristic of the Subsequent 37’s lter is resonance.
Resonance increases the level of audio frequencies closest to
the cutoff frequency by making the lter roll off frequencies less
gradually. It regenerates those frequencies by feeding them back
to the lter. Turning up the resonance emphasizes harmonics
closest to the cutoff frequency and exaggerates any changes to
the cutoff frequency.
FILTER CONTROLS
CUTOFF
Use this knob to change the lter’s cutoff frequency. Its lowest setting is 20Hz, which effectively closes
the lter and doesn’t allow any audio to pass through. Its highest setting is 20kHz, which opens the
lter completely and allows all audio to pass through.
RESONANCE
Use this knob to control how much signal is routed from the lter’s output back to its input. Turning
it clockwise increases the resonance, causing a peak in amplitude at the cutoff frequency. Settings
above 7 cause the lter to self-oscillate.
MULTIDRIVE
MultiDrive is the Subsequent 37’s distortion processor, offering effects ranging from asymmetrical,
tube-like warmth to aggressive hard clipping, with a smooth continuous transition in between. The
MULTIDRIVE knob controls how hard you drive the OTA and FET stages, which are located between
the lter and the amplier in the signal path. The higher the setting, the more aggressive the clipping
effect. Varying amounts of MultiDrive can give your sounds a distinct tonal edge, as well as make them
more responsive to changes in lter resonance, waveform, and oscillator levels.