25
Spectral Amplitude Modulation Mode (SAM)
(cont.)
The Focus control sets the size of the ranges of harmonics that will be activated by the Spectraphon. At
low values, smaller ranges of frequencies will be heard and the individual harmonics will tend to be more
pronounced and change in amplitude more quickly as the input sound changes or Slide is modulated. At
higher values, more harmonics will be heard and they will tend to “ring” longer after changes in the sound
source or in modulation to Slide. At the highest values, many harmonics are heard and they will have a
noticeably sluggish response to change, creating droning effects and even something like “echo” at times.
The spectrum created by this spectral amplitude modulation appears at the Even/Odd outputs and is
further affected by the Pitch, Partials, and FM controls as follows:
- The
Pitch
control sets the fundamental frequency from which the spectrum will be resynthesized at the
even/odd output.
- The
Partials
control operates on the current spectrum by changing the amplitude of the individual
harmonics.
- The
FM Index
control frequency modulates the harmonics of the spectrum using the core of the other
Side of the Spectraphon (FM).
In SAM the Pitch, FM, and Partials controls all work the same way as in SAO,
and can be sequenced
and modulated much as you would one side of a dual voltage controlled oscillator. The only significant
difference as regards these controls is that instead of oscillating at all times as a typical analog VCO does,
the amplitude is modulated by an external signal. If the external signal contains a lot of dynamic motion,
so will the harmonic outputs. If the external signal is a constant amplitude (another VCO, for example, or
even the other side of the Spectraphon itself), then so will be the harmonic outputs.
In SAM the default output for Sub/CV is an envelope follower. This will output a positive control voltage
representing the current amplitude of the sound at the input. It can be particularly useful when patched
to Slide or Focus to add clarity, and can also be used to time any other modulation in your system to the
sounds that you are using to modulate the Spectraphon.
Summary of Contents for Soundhack Spectraphon
Page 1: ...Soundhack Spectraphon ...
Page 34: ...Patch Corner 34 Coming soon ...