15
Next, take the SPECTRAL SHIFT knob and slowly begin
to move it up and down. You will hear the filter begin to
move up and down the frequency spectrum.
Begin to raise the RESONANCE to its maximum and you
will hear the filter band start to whistle on top of the
bandpass filtered carrier sound.
Spectravox is a unique exploration of the
topology of the vocoder due to its filter
design. Whereas most previous analog
filter banks have their filters fixed in place,
all 10 filters of Spectravox can be shifted
up and down the frequency spectrum!
Additionally, its filters all have variable
RESONANCE, which provides for colorful
sound design possibilities.
SPECTRAL SHIFT
EXPLORING SPECTRAVOX (Continued)
FIVE FILTERS
Set SPECTRAL SHIFT back to its initial position (12 o’clock) and bring the
RESONANCE down while leaving filter 5 open. Now, begin to fade in filter 1—a
lowpass filter. You will notice the low frequency components of the VCO and
low noise rumbles fade in.
Bring up filters 3, 7, and 9 as
well—slowly, so that you hear the
interesting harmonic shapes emerge
as you adjust the spectral shape of
the carrier. This is the power of a
filter bank, allowing you to sculpt the
frequency spectrum of a sound.
3 7 9
1
15
FREQUENCY (Hz)
1200
AMPLITUDE
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