10.6

331Logic Pro Effects
• US 1 x 12 open back (GarageBand): Open enclosure of an American lead combo with
a single 12” speaker.
• US 1 x 12 bass reflex (GarageBand): Closed bass reflex cabinet with a single
12” speaker.
• DI Box: Bypasses the speaker simulation section.
• Amp-Speaker Link button: Links the Amp and Speaker pop-up menus, so that
changes to amp model selection result in the speaker associated with that amp
also being loaded.
Logic Pro Legacy Guitar Amp Pro EQ
The EQ pop-up menu and the Amp-EQ Link button are near the top of the interface.
EQ parameters
• EQ pop-up menu: Contains the following EQ models: British1, British2, American, and
Modern. Each EQ model has unique tonal qualities that affect the way the Bass, Mids,
and Treble knobs in the Amp section respond.
• Amp-EQ Link button: Located between the Amp and EQ pop-up menus, links these pop-
up menus so that when you change the amp model, the EQ model associated with that
amp is loaded automatically.
Each amp model has a speaker and EQ model associated with it. The default
combinations of amp, speaker, and EQ settings re-create a well-known guitar
sound. You can combine any speaker or EQ model with any amp by turning off
the two Link buttons.
Logic Pro Legacy Guitar Amp Pro amplifier controls
The Gain, Bass, Mids, Treble, Presence, and Master knobs run from left to right in the
V-shaped formation in the upper half of the interface.
Amplifier parameters
• Gain knob: Set the amount of pre-amplification applied to the input signal. This control
has different effects, depending on which Amp model is chosen. For example, when you
are using the British Clean amp model, the maximum Gain setting produces a powerful
crunch sound. If you use the British Gain or Modern Gain amps, the same Gain setting
produces heavy distortion, suitable for lead solos.
• Bass, Mids, and Treble knobs: Adjust the frequency range levels of the EQ models,
similar to the tone knobs on a hardware guitar amplifier.
• Presence knob: Adjust the high frequency range level. The Presence parameter
affects only the output (Master) stage of Guitar Amp Pro.
• Master knob: Set the output volume of the amplifier—going to the speaker. For tube
amplifiers, increasing the Master level typically produces a more compressed and
saturated sound, resulting in a more distorted and powerful—that is, louder—signal.
High Master settings can produce an extremely loud output that can damage your
speakers or hearing, so ramp this up slowly. In Guitar Amp Pro, the Master parameter
modifies the sonic character, and the final output level is set using the Output
parameter at the bottom of the interface.