Fractal Audio Axe-Fx III, Руководство пользователя

Страница: 64 / 151

58
8 BLOCKS GUIDE
ă
TONE PAGE
Input Drive
– (aka “Drive”) sets the amount of preamp gain/distortion. Used in conjunction with the
Master Volume, Input Drive determines whether the sound will be clean, slightly broken up, moderately
overdriven, or fully distorted.
A treble peaker circuit found on the drive or volume control on many amps is also modeled. This can be heard as
the low frequencies are attenuated more than the highs when the drive is turned down (and vice versa). For amps
that have no Master Volume, Input Drive functions as the amp’s Volume control.
Bass, Mid, Treble
– Adjust these as you would the controls on any amp.
While other modelers use simple filters to approximate amp tone controls, the Axe-Fx III recreates the exact
frequency and phase response characteristics of a classic passive tonestack. In most cases, knob positions
can even be matched to settings on the original amps. (Though recognize that many types of amps were built
inconsistently with different types of potentiometers from one run to another.)
Axe-Fx III models may provide tone controls NOT offered on the original amp. For example, many amps have no
Mid control. To faithfully simulate such amps, set controls they are missing to “noon” (or “0” if you are using the
“ACTIVE” Tonestack Type). Of course, you may still adjust these “bonus” controls to achieve tones the original
amp does not have.
Please note that extreme tone and high gain settings can cause pickup squealing or excessive noise. This is
especially true with Tonestack Type set to “ACTIVE.”
Bright Switch
– Many amplifiers contain a “treble peaker,” included as a pull or toggle switch, or even hard-
wired. Each amp type on the Axe-Fx III includes this control (even if the original mode does not). The effect may
be subtle or quite pronounced depending on the amp type. This is also affected by the Bright Cap setting. If the
original amp had no bright circuit, Bright is OFF by default but can still be turned on to apply circuit values suited
to an amp of that general type. If the amp has a hard-wired treble peaker, the default state is ON.
Input Trim
– Amps without an Overdrive control (below) will display Input Trim instead. This allows you to adjust
for more or less preamp gain than the actual circuit being modeled. This is different from the Input Drive in that it
does NOT interact with the surrounding circuitry to change frequency response as it is varied. In short, use Input
Trim to adjust gain without also changing tone.
Overdrive
– Amps with Overdrive will not display Input Trim (above). Adjusts overdrive. Note that Drive and
Overdrive are applied to the appropriate points in the circuit for the amp being modeled, i.e. prior to the last triode
stage or prior to the third triode.
Presence/Hi-Cut
– Boosts (or cuts) the upper frequencies from the virtual power amp by varying the negative
feedback frequency response. Increased presence can help a sound cut through. Note that settings for Presence
don’t necessarily correspond to knob positions on the amp being modeled.
Amps with no negative feedback circuits in their design cannot utilize a realistic presence control. Therefore, if
Negative Feedback is set (manually or automatically) to “0”, Presence becomes a high-shelf EQ at the output of
the power amp, and its label changes to Hi-Cut. This allows you to control power amp highs even for amp models
that wouldn’t normally have this capability. When changing to a model with no negative feedback (i.e. Class-A,
etc.), be sure to check your Hi-Cut settings as values higher than zero will darken the sound.
Depth
– Boosts low frequencies from the virtual power amp by varying the negative feedback frequency
response. It is set by default to an appropriate value when the amp type is selected, but this setting may be
overridden.
Note: Presence and depth are disabled when Power Amp Modeling is turned off. For more on disabling Power
Amp Modeling, see Supply Sag ( p. 61 ) and “Global Settings: Config Page” on p. 112 .