Arpeggiate the spectrum. A waveform sweeps up and down through the spectrum at a specified rate (frequency), selecting or emphasizing the partials it passes through, or which lie below or above it. The focus (selection/emphasis) is on a band of frequencies (by default the channel bandwidth) ― the Sweep Band, whose centre is sweeping up and down. The sweep is between lo freq and hi freq; these limits define the main Frequency Band: ![]() MODES 1. On: Play only partials within arpeggiated Frequency Band. 2. Below: Play only partials within and below Frequency Band. 3. Above: Play only partials within and above Frequency Band. 4. Boost: Emphasise partials within Frequency Band; others are unamplified. 5. Boost below: Emphasise partials within and below Frequency Band after initial sweep (not wave type 1). 6. Boost above: Emphasise partials within and above Frequency Band after initial sweep (not wave type 4). 7. Once below: Play only partials within and below Frequency Band once; then play whole sound as normal (not wave type 1). 8. Once above: Play only partials within and above Frequency Band once; then play whole sound as normal (not wave type 4). PARAMETERS wave type The waveform used for the sweep. Values: 1.
DOWN-RAMP 2.
SINE 3. SAW 4. UP-RAMP (See Mode
for certain
restrictions.)
rate
Number of sweeps
per secondRange:
0.001-
344.5 Hz T-V (varies with PVOC
Analysis Sample Rate e.g. 344.531 is for
1024 points)
[start phase] Initial
phase
of sweep waveform. May have limited effect on sound.
Range:
0-1. (Mode
8: must be > 0.5 with
sine/saw wave
types)
[lo freq] Lowest
frequency
that arpeggiation sweeps down to. Range: 5-22050 Hz,
default 0 Hz. T-V
[hi freq] Highest
frequency
that
arpeggiation sweeps up to. Range: 5-22050 Hz,
default 22050 (Nyquist). T-V
[bandwidth] BANDWIDTH of Sweep
Band,
in
Hz. (Not Modes 5 and 6.)Range: c. 43
-
22050 Hz. Min. and default = channel bandwidth
(Nyquist/channel_count). T-V
[amplify] Amplification
of
arpeggiated
partials; (0 to 10000, default 10.0)Range: 0 to 10000, default 10.0.
T-V
[decay
rate] Non-linear
rate of decay of
arpeggiated tones (default linear); > 1 is faster, <
1 is slower.Range: 0.02 to 50.0,
default 1 (linear). Values higher than about 7 can
reduce output to
silence. T-V
[sustain] Number
of
analysis windows over which arpeggiated partial sustained.
High
values, especially combined with a long decay time, can
cause amplitude
overflow.Range
(windows):
1 - number of windows; default 3. T-V
NOTES Mode 1 picks out the component partials in turn: this can be useful for analysing the content of an inharmonic sound. Mode 2 is akin to a filter-sweep effect: the partials are arpeggiated on top of the original sound. There appears to be a delay before the effect kicks in. N.B. * Soundshaper's mode numbering is slightly different from CDP's.
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