10.6

Table Of Contents
282Logic Pro Instruments
Modulator and Carrier parameters: The FMengine consists of the modulator and carrier
parameters (raised, darker sections), and the FMIntensity knob (in the center). These
are the key controls for setting the basic tone of EFM1. See Logic Pro EFM1 Modulator
and carrier overview.
Modulation parameters: The modulation envelope and LFO at the top and bottom of the
mushroom-shaped area in the center respectively are used to animate the sound. See
Logic Pro EFM1 modulation parameters.
Output parameters: The bottom section houses the Output section, which includes the
Sub Osc Level and Stereo Detune knobs that can be used to thicken the sound. The
volume envelope, Main Level, and Velocity controls are used to set the EFM1 level. See
Logic Pro EFM1 output parameters.
Randomize parameters: The Randomize field and button in the lower-right corner are
used to create random variations of the current settings, resulting in new sounds. See
Create random Logic Pro EFM1 sounds.
Extended parameters: Accessed by clicking the disclosure triangle at the lower left of
the interface, these parameters allow you to assign MIDI controllers to the FMDepth
and Vibrato parameters. See Logic Pro EFM1 extended parameters and Logic Pro EFM1
MIDI controller assignments.
EFM1 modulator and carrier parameters
Logic Pro EFM1 Modulator and carrier overview
In FMsynthesis, the basic sound is generated by setting different tuning ratios between
the modulator and carrier oscillators and by altering the FMintensity. The tuning ratio
determines the basic overtone structure, and FMintensity controls the level of these
overtones.
At the core of the EFM1 synthesis system is a multiwave modulator oscillator and a sine
wave carrier oscillator. The basic sine wave of the carrier oscillator is a pure, characterless
tone.
To make things more sonically interesting, you use the modulator oscillator to modulate the
frequency of the carrier oscillator. This modulation occurs in the audio range—you can hear
it—and results in a number of new harmonics becoming audible.
The pure sine wave of the carrier oscillator is combined with the newly generated
harmonics, making the sound more interesting.