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Table Of Contents
EFFECTS MENU 569
- guitar active
A convertible partner for typically American high-gain sound. The parameters do not
influence each other much unlike the passive variant, although a slight amount of internal
feedback is applied to give the circuit a bit more power. Of course, this also influences the
phase response and this way can similarly offer its own character.
- bass passive
A full-tube Peavey bass pre-amp was the source of inspiration for this EQ (T. B. Raxx,
similar to Alpha), with a circuit that resembles various Marshal/Fender playing methods.
However, the bass branch does not depend as strongly on the other settings; however,
there is a high level of interactivity otherwise. If the mids are "weakened", the sound turns
quite "hollow", ideal for slap basses.
- bass active
Similar to "Guitar active". However, the corner frequencies are designed for bass guitars.
4) Gain
The gain level as an emulation of class A tube circuitry is the heart of
am-phibia. You have to simply set the gain setting, and the "magic"
happens inside. For one, this changes the frequency response,
resulting in the right limit containing much fewer highs.
Some make-up gain is used to automatically compensate the quite high amplification factor
so that typical valve-like distortions and harmonics occur at the upper end without
becoming too loud. Normally, such high-gain circuit simulations have a weak spot at such
a high degree of non-linearity: so-called aliasing. The harmonics created by distortions
ideally exceed the audible range. At a sample rate of e.g. 44 kHz, nasty artifacts occur due
to signal mirroring of the Nyquist frequency (22.5 kHz) in the audible range (without
harmonic relation). This is particularly annoying with distorted guitar sounds, for instance, if
you "bend" at the 24th fret when playing solo and aliasing becomes apparent by a bending
in the opposite direction. For this reason we always leave the internal sample rate of the
gain stage at 176 to 192 kHz, in order to minimize artifacts.
5) Postfilter
This section only provides a low and
high band equalizer; however, you can
adjust the cutoff frequency point of both
(see below in "Expert" view).
- Active
The same parameters as the pre-filter stage, except that the mid band is missing.
- Passive cut
Baxandall (cut) network as in the pre-filter. Also without mids.