Virgo DiBiQuadro User manual

Version 1.0

2
Thanks for purchasing DiBiQuadro Virgo. Please take your time to read carefully the content of this manual
before using the plugin.
Overview
Virgo is a library for Nebula 4 / Nebula 4 Player based on what has truly established itself as the “industry
standard” for combo/self-contained all-tube guitar amplifiers. The sampled model is a '65 reissue of the version
often referred to as “Blackface”, used on thousands of recordings and countless live performances, proven to
be incredibly versatile not only for guitar but also bass, keyboards, vocals, accordion, electric violin and many
other electrified instruments.
The main core of Virgo has been sampled with top class cables/gear to obtain the greatest path possible.
Additionally, two pristine reverbs - a Room (default) and a Rich Plate - have been taken from a highly acclaimed
digital hardware reverb unit; then, two different flavors of vintage tremolo – mono and stereo – have been added
to satisfy your need for surf music and significantly multiply the sound possibilities; finally, a built-in limiter
completes the chain.
Three output modes are available. The power amp provides pristine clarity, great dynamics and a larger than life
frequency response: this option sounds great by itself; however, if you want to use your own IRs, this is the
starting point. The 57 and 201 options give you two great dynamic microphones, masterfully placed in front of
the open-back cabinet to get the fullest tone possible. The sweet spot has been determined by injecting pink
noise in the amp and by minimizing phase cancellations on the best sounding speaker of the combo.
Like in every our product, each band and preamp has been sampled without any converter / “calibration bias”
phase distortion. This allows to overlap the effect of more bands without adding unwanted coloration, reaching
a new level of match with hardware for unparalleled results, even compared to hardware itself. This
methodology is named SP Tech.

3
The Best All-Tube Clean Amplifier Plugin
We claim Virgo is THE best clean all-tube amplifier plugin on the market so far. Virgo's heart is a pre/power amp
section made up of 10 harmonics x 30 levels = 300 different FIR impulses (in High Definition mode). This
represents a completely different solution from the usual algorithmic / IIR based plugins and the most accurate
existing reproduction of the original amp, which naturally can be felt both during playbacks and “under your
fingers” while playing in low-latency mode. Incredibly, Virgo shows surprising and unexpected increased
dynamics even compared to the “real thing”!
Specifications

4
User Interface
INPUT: it adjusts the amount of harmonic distortion without affecting the overall output level; avoid settings
that may cause unwanted harmonic distortion or digital clipping.
OUTPUT: it adjusts the overall output of the plugin without affecting the tone when the limiter is deactivated;
this control is placed before the limiter.
PWR: it selects the power amp output with no speaker; use this option by itself or as the source for an external
IR speaker loader.
57: it selects the 57 microphone output.
201: it selects the 201 microphone output.
LIMIT: it activates the limiter section which is placed after the output section.
THRESHOLD: it decreases the threshold of the limiter from 0dB to -12dB when the limiter is activated.
MAKEUP: it is the makeup gain of the limiter; it affects the overall output of the plugin when the limiter is
engaged.
MIX: it adjusts the balance between the dry sound going to the limiter and the output of the limiter; when set to
max, you will hear only the output of the limiter; at minimum, it is like having the limiter deactivated.

5
TONE STACK: it enables the tone stack controls (TREBLE, MID, BASS): when disengaged, its controls are set
internally to 5 and the BRIGHT is deactivated.
BRIGHT: when the TONE STACK is engaged, it significantly boosts the high mid / high part of the spectrum in the
tone stack section.
REVERB: it enables the reverb: room reverb is activated by default; when RICH is engaged, the Rich Plate is
selected. DRY and WET select the amount of dry versus reverb signal.
TREMOLO: it enables the tremolo effect: mono tremolo is activated by default; choose STEREO to obtain a
stereo effect. DRY and WET select the amount of dry versus tremolo signal. SPEED increases the speed of the
tremolo.
Regular mode versus Low-Latency (ZL) mode
Virgo has been tuned to work flawlessly on reamping and mixing sessions at any sample rate – 44.1KHz, 48KHz,
88.2KHz or 96KHz. However, enabling all its functionalities – particularly REVERB, TREMOLO and LIMIT –
requires an important amount of resources. For these activities, just use the regular “high-latency” version of
Virgo.
With some limitations – Only TONE STACK and OUT sections activated – and the proper configuration, Virgo ZL
– “low-latency” mode – is suitable for playing in real time at 44.1KHz or 48KHz. We recommend these settings:
 Open “VIRGOZL.xml” with a text editor and set FORCEOFFSET tag to 23:
o <FORCEOFFSET> 23 </FORCEOFFSET>
 Set ASIO latency to 128 samples.
Now you are ready to load Virgo ZL on your favorite sequencer, plug your guitar in and enjoy the sound.
New Revisions - Backward Compatibility
We cannot assure compatibility between new revisions and previous ones. Even presets are specific for a
particular revision and not applicable to another. Anyway, before doing any upgrade we recommend making a
copy of the settings by using Presets functionality on Nebula or a visual copy (e.g. Print Screen and save image
file). In case of issues after upgrade it is possible to downgrade by selecting the desired revision on Aquarius and
eventually restore old presets.

6
E = (db) 2