10.6

Table Of Contents
18Logic Pro Effects
Logic Pro Amp Designer amplifier controls
The amp parameters include controls for the input gain, presence, and master output. The
Gain knob is located to the left in the knobs section, the Presence and Master knobs are
to the right, and the Output parameter is at the lower-right edge of the interface.
Amplifier parameters
Gain knob: Set the amount of preamplification applied to the input signal. This control
affects specific amp models in different ways. For example, when you use the British
Amp, the maximum gain setting produces a powerful crunch sound. When you use the
Vintage British Head or Modern British Head, the same gain setting produces heavy
distortion, suitable for lead solos.
Presence knob: Adjust the ultra-high frequency range—above the range of the Treble
control. The Presence parameter affects only the output (Master) stage.
Master knob: Set the output volume of the amplifier signal sent to the cabinet. For tube
amplifiers, increasing the Master level typically produces a compressed and saturated
sound, resulting in a more distorted and louder signal.
WARNING: Because high Master knob settings can produce an extremely loud output
that can damage your speakers or hearing, start with a low Master knob setting and
then slowly increase it.
Output slider or field: Set the final output level of Amp Designer.
Note: The slider is replaced with a field in the small interface.
Logic Pro Amp Designer EQ overview
Hardware amplifier tone controls vary among models and manufacturers. For example, the
treble knobs on two different models may target different frequencies or provide different
levels of cut or boost. Some equalizer (EQ) sections amplify the guitar signal more than
others, thus affecting the way the amp distorts.
Amp Designer provides multiple EQ types to mirror these variations in hardware amplifiers.
All EQ types have identical controls—Bass, Mids, and Treble—but these controls can
behave very differently depending on which EQ type you choose.
Selecting an EQ type other than the one traditionally associated with an amplifier usually
results in significant tonal changes. As with hardware amplifiers, Amp Designer EQs are
calibrated to perform well with particular amplifier models. Choosing other EQ types can
sometimes produce a thin or unpleasantly distorted tone.