Future Retro XS - Manual (Page 28)

ANALOG CONTROLS
FILTER
The most common way to alter the harmonic content of a sound is by using a filter. The XS provides a
12 dB filter with four filter types including lowpass, highpass, bandpass, and notch responses. There is
also a cutoff control for determining the frequency of the filter and a resonance control for accentuating
these frequencies. In addition, the filter has a dedicated overdrive section at its output for adding that
essential extra crunch we love so much!
FILTER TYPE: The filter type control selects one of four possible filter responses to determine how the
filter will attenuate certain frequencies of a sound.
The LOW setting selects the lowpass filter, where low frequencies are allowed to pass through the filter
while higher frequencies are attenuated.
The BAND setting selects the bandpass filter, where only the frequencies closest to the filter’s cutoff
frequency are allowed to pass through the filter, while attenuating all frequencies higher and lower than
the cutoff frequency.
The HIGH setting selects the highpass filter, where only the high frequencies are allowed to pass
through the filter while the lower frequencies are attenuated.
The NOTCH setting selects the notch filter, where harmonics closest to the cutoff frequency are
attenuated while all other harmonics are allowed to pass through the filter.
CUTOFF: The cutoff control determines the point at which frequencies are attenuated by the filter.
The filter cutoff range is approximately 5 Hz to 18 kHz. Rotate this control counter-clockwise to select
lower frequency settings, or clockwise to select higher frequency settings for the filter. In addition to this
control, you can also use modulation sources to animate the filter’s cutoff frequency, which will be
described in more detail under the Filter Modulation section of the manual.
RESONANCE: The resonance control is used to increase or accentuate those frequencies closest to the
cutoff frequency set for the filter. When this control is rotated fully counter-clockwise, no resonance will
occur in the filter. By rotating this control clockwise more resonance will be introduced into the filter,
with the highest setting causing the filter to self-oscillate. When the filter self-oscillates it will produce a
pure sine wave tone that can be used as an audio source.
OVERDRIVE: The overdrive control clips the output of the filter in a unique way to provide harmoni-
cally rich tones. When this control is rotated fully counter clockwise, sounds will pass cleanly through
the filter without any distortion. Rotate this control clockwise to increase the amount of distortion.
Note the amount of signal being sent to the filter’s input will also affect the overdrive tone produced.
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