FXpansion GURU - Manual (Page 76)

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• The amplitude envelope shape of the sample provides the amplitude envelope for the Osc. It is
determined by an envelope follower which tracks the amplitude of the sample. The signal is then
routed through the regular Amp Envelope of the layer.
• The Oscs also have an FM (Frequency Modulation) feature, which modulates the pitch of the
Osc with the waveform of the sample on the layer. The modulation is shaped by the FX Envelope.
If you consider the signal path of a Pad layer in GURU, you will realize that the Pad effect slot
comes before the filter. With this in mind, it should be noted that using an Osc unit turns a layer
into a simple 1-oscillator subtractive synth with sample FM. When you layer 8 Oscs on a Pad,
and control them with Pitch Graphs, a whole new dimension of sound possibilities are created.
All manner of timbres, from fat subs and filter-swept basses to special effects and deep textures
are possible.
Each Osc unit has the following two controls:
Freq (semitones)
The basic pitch of the Osc: all Pitch modulation will be relative to this base frequency.
FM-Depth (0 to 100)
This is the depth to which the Osc’s pitch will be modulated by the frequency of the layer’s sam-
ple waveform, shaped by the FX Envelope.
• OSC-NOISE
This is a special type of Oscillator which synthesizes noise. It is capable of generating stereo
noise, if used on a layer with a stereo sample, and is blendable between pink and white noise.
Please note that, due to the characteristics of white noise, it actually ‘sounds’ mono when in fact
it is stereo. You will also experience this psychoacoustic effect if you cut lower frequencies on
pink noise.
Noise is useful for drum synthesis: it can be used for snares, hihats, cymbals and other cutting
percussion sounds, especially when combined with resonant filtering.
The two parameters are:
Freq (semitones)
The sample-and-hold frequency of the noise generator.
Colour (pink to white)
This control allows you to blend between pink and white noise types.