The Spectral Grains playback algorithm uses FFT analysis to analyze the frequency content (partials) of the original
sample. You can then stretch the generated signal by pitch-shifting the partials, and also filter out inharmonic partials.
This way you could continuously transform inharmonic signals into harmonic signals, for example. You can also draw
your own formant curves in the spectrum display to give the sounds different pitches/characters.
• Snap
This pitch-shifts inharmonic partials towards the closest harmonic partials. At 0% the sound is almost unaffected
and at 100% the sound contains only harmonic partials.
• Filter
Instead of pitch-shifting inharmonic partials towards harmonic ones, as the Snap control above does, the Filter
control filters out the inharmonic partials and keeps the harmonic ones. Since the filter slopes are not brickwall
shaped some of the inharmonic partials (if any) will remain audible even at 100%.
• FFT Size
This sets the accuracy (and speed) of the frequency analysis. “0” is the fastest detection, but this also leaves out
detection of low frequencies. “3” is the most accurate detection. However, it’s also slower since it also detects lowfrequency material (which takes longer to detect).
• Curve
With the Curve tool you can draw your own formant curves in the frequency spectrum. Drawing above the pink
area means the partials are amplified, and drawing below the pink area means the partials are attenuated.
• Amount
Set the gain/attenuation amount of the drawn formant curve (see “Curve” above). At 0% the curve is completely
flat.
• Formant
Sets the initial pitch of the sample, together with the Root Key setting (see “Root Key”). If Snap and Filter are both
set to 0%, the Root Key and Formant controls the pitch of the signal. This also means that the Pitch parameters
(see “Pitch controls”) and Pitch wheel (see “Pitch”) have no effect. To have the Formant track the keyboard in a
musical way, make sure the Formant Kbd parameter (see below) is set to 100%.
When you raise the Snap or Filter parameters towards 100% the sound gradually adapts to the Pitch settings instead, and the Root Key and Formant parameters now affect the tone color instead.
25 авг 2024
