Type
Tube Class A
Simulates a complete tube preamp. ‘Class-A’ means a single vacuum
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tube with DC bias that creates odd and even harmonics. Due to the
asymmetry of the curve, class-A distortion sounds relatively warm.
Tube Class AB
Simulates a preamp with a pair of tubes in a ‘push-pull’ configuration,
................
resulting in symmetrical distortion without any even harmonics
.
Tube 2 Stages
Simulates a preamp with two class-A stages in series. Like simple class
.................
A, this also creates odd and even harmonics, but the results are richer
and more dynamic. This mode applies internal filtering and feedback for
more sonic complexity. Note: High gain settings will give you extra bass.
Hard Clip
Simply chops the top and bottom off the waveform.
...........................
Rectify
Full-wave rectification – the negative half-wave becomes positive, and
...............................
DC is removed from the resulting waveform.
Foldback
Foldback distortion is similar to soft-clipping, but increasing the gain
...........................
doesn’t slam the signal against the ‘ceiling’. Listen out for strange
intermodulation effects in this mode!
Pre Tilt
A low and high shelving combination EQ is applied to the input, and
Pre Tilt
makes the distortion
frequency-dependent (at zero, the response remains flat). Negative values tend to strengthen
the bass and weaken the treble, while positive values have the opposite effect.
Post Tilt
Balances the tone after the distortion, e.g. to compensate for
Pre Tilt
.
Center Freq
Combined low and high shelf cutoff frequency control.
Post Filter
Dual-Band Shelf
A simple corrective EQ: a low shelf at 100Hz, and a high shelf at 10kHz.
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Guitar Cab 4x12
Emulates the frequency response of a certain popular speaker cabinet,
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producing its typical mid-range focussed sound. Includes the peaks and
troughs caused by cabinet resonance, as well as close-mic effects.
Low
/
High
In
Dual-Band Shelf
mode, they control the gains of the shelving filters. In
Guitar Cab
4x12
mode
they set the amount of cabinet resonance (i.e. bass response and speaker 'edge').
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