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Using Guitar Amp Pro’s Gain, Tone, Presence, and Master 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.
• Gain knob: Sets 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: Adjusts the high frequency range level. The Presence parameter affects
only the output (Master) stage of Guitar Amp Pro.
• Master knob: Sets 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. See Setting the Guitar Amp Pro Output Level.
Getting to Know Guitar Amp Pro’s Effects Section
The effects parameters include Tremolo, Vibrato, and Reverb, which emulate the processors
found on many amplifiers.
You can use the pop-up menu to choose either Tremolo, which modulates the amplitude
or volume of the sound, or Vibrato, which modulates the pitch.
Reverb can be added to either of these effects, or used independently.
To use or adjust an effect, you must first enable it by clicking the corresponding On button
to the left. The On button is red when active.
Note: The Effects section is placed before the Presence and Master controls in the signal
flow, and receives the preamplified, pre-Master signal.
Tremolo, Vibrato, and Reverb are described in the following sections:
• Using Guitar Amp Pro’s Tremolo and Vibrato Effects
• Using Guitar Amp Pro’s Reverb Effect
35Chapter 1 Amps and Pedals