10.6

Table Of Contents
55Logic Pro Instruments
Detune knob: Set the amount of detuning and stereo width variance between unison
voices.
Noise on/off button: Enable or disable the noise oscillator.
Noise pop-up menu and field: Choose a noise waveform. These have different spectral
characteristics that can be further refined with filters. You can step through the
available waveforms with the Previous and Next buttons (the arrows).
(Noise) Vol knob: Set the output level of the noise oscillator. When multiple elements
are used in a source, use this control to set the relative level of the noise component.
Tune knob: Set the tuning of the noise signal.
Low Cut knob: Set a low cutoff frequency for the noise oscillator. All frequencies above
this value are allowed to pass. All frequencies below are attenuated.
High Cut knob: Set a high cutoff frequency for the noise oscillator. All frequencies
below this value are allowed to pass. All frequencies above are attenuated.
The Low Cut and High Cut parameters work in conjunction with each other to act as a
bandpass filter, where the noise signal that falls within the two cutoff ranges is allowed
to pass.
Logic Pro Alchemy source modulations
Source components are shown only in advanced view. Click the Advanced button to switch
to advanced view.
Most Alchemy source parameters, such as Pan, Tune, and Position, can be modulated
by modulation sources such as AHDSRs or LFOs. Parameters that have a modulation
assignment are indicated by an orange arc around the control. See Logic Pro Alchemy
modulation overview.
Note: Parameters that are morphed and have a modulation assignment show both an
orange and green arc around the control.
This section focuses on Position, which is a modulation target. The principles discussed
apply equally to other source parameter targets.
Position determines the playback position of audio data. When modulated, the playback
path through the audio data is controlled by the selected modulation source. In sampler
mode, the note-on modulation value determines the initial offset for the play position within
the audio data. Beginning at that position, the rest of the sound plays in a normal manner,
although looped as if the Loop mode is set to All. In additive, spectral, or granular mode,
Position can be continuously modulated forward or backward at any rate (including zero).
Create tempo-synced loops by modulating position
Synchronized playback of looped audio with the Logic Pro tempo is easy to achieve by
modulating the Position parameter. This technique is possible with any synthesis method
that permits continuous modulation of Position. This example uses the granular engine, but
the same technique can be applied to the additive and spectral engines.