5
Overview of SKANNER Ensemble
SKANNER is based on “Sample Lookup”, a minimalistic sample playback module from the
early days of REAKTOR, and utilizes the audio signal at the input of this module to control the
playhead position in the selected sample from where the value is read and passed to the out
put. The audio signal produced at the (stereo) outputs depends heavily on the input signal and
the content of the sample file.
The content of the output signal can be manipulated further by using an oscillator connected
to the input. This creates an output signal in sync with the frequency of the oscillator. In this
case, the sample works similar to a wave-table that is read by the oscillator. This can also be
compared to a wave-shaper since the shape of the sample is applied as distortion to the input
waveform. If the oscillator runs at a very slow rate the result can be compared with the scratch
ing of a DJ. With increasing rates the signal being read gets into the audio range and domi
nates the perceived pitch.
If only a part of the sample is read by the oscillator, the position and width of this part deter
mines the waveform of the output signal. Raising the oscillator amplitude will compress more
of the sample waveform into one period and will lead to a more complex and bright signal.
In the part of the sample that is being read, the center of this oscillation can be shifted by an
adjustable offset or a slow moving signal. Moving the center of the oscillation will create
changing waveforms at the output.
While a classical wavetable would be read by a linear ramp (sawtooth) oscillator, the end of the
waveform has to match the beginning. An oscillator waveform without steps like a sine wave
can read a continuous, glitch-free signal from the sample, without having to take care about
loop points.
The sample reading signal is created as a sum of:
▪
two Sliders for coarse and fine positioning, processed by smoothing filters
▪
Oscillators A and B (each producing a sine, triangle or sawtooth waveform)
▪
the Polyphonic LFO
▪
the Envelope
▪
the Feedback signal
Overview of SKANNER Ensemble
SKANNER - Manual - 18
Summary of Contents for Skanner
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