DiBiQuadro GeminiPTE Manuale utente

USER MANUAL

INDEX

Passive Tube Equalizer in a Double Format.…………………………...

The perfect approach to circuit modeling…..………………………..

About (db)2………………………………………………………………….

GUI: tooltips and Edit Mode……………………………………..………..

Controls……………………………………………………………………….

GUI useful tricks…………………………………...………………...……….

Edit Mode……………………………………………………………………..

SET……………………………………………………….……………………..

TWEAK………………………………………………………..………………..

Thanks for purchasing DiBiQuadro

GeminiPTE. This is the result of a

meticulous engineering design and

passion for perfection.

Please take your time to read carefully

the content of this manual.

Passive Tube Equalizer in a

Double Format

Imagine a seasoned audio wizard in

the world of music and sound. This

magical device, known for its

distinctive tube-based circuitry,

possesses a distinct and enchanting

sonic aura that’s often described as

warm and colorful. GeminiPTE

recreates this pure magic in a glorious

double format. Mono, Stereo or

Mid/Side processing are available at

your finger tip.

Sound

Warm and Colorful: GeminiPTE brings a

warm and vibrant character to your

audio, like the inviting glow of a

crackling fireplace on a winter’s night.

It’s as if it paints your sound with musical

hues.

Tube Magic: This mystical device

harnesses the power of tubes, much

like the age-old practice of brewing

potions. These tubes introduce a

delightful touch of harmonic distortion

and saturation, wrapping your audio in

a cozy analog embrace.

Boost and Cut: One of its most intriguing

spells is the ability to simultaneously

boost and cut the same frequencies.

It’s like the yin and yang of audio

shaping, allowing you to sculpt your

sound in a way that’s simply

enchanting.

Gentle Waves: Picture its EQ curves as

gentle, rolling waves, caressing your

sound with care. It doesn’t abruptly

alter your audio; instead, it weaves

subtle, harmonious changes

throughout.

Applications

Tonal Wizardry: GeminiPTE is a go-to

choice for shaping the tonal essence of

your audio. It’s like having a musical

sorcerer at your disposal, ready to add

warmth, presence, or clarity to

instruments and vocals with a flick of

their wand.

Mastering Mastery: When mastering

your musical creations, GeminiPTE

works its final enchantments. It imparts

a polished and melodic touch,

preserving the dynamic soul of your

mix.

Drum Enchantment: For drums, it acts as

a rhythmic spellcaster, enhancing the

low-end thump and high-end shimmer

of kick and snare drums. It brings

weight and sparkle to these percussive

spirits.

Vocal Charms: When weaving its

magic on vocals, it bestows a vintage

and soulful charm, enhancing the

singer’s unique timbre and making their

voice resonate in the mix.

Guitar and Bass Enchantment: Electric

guitars and basses are like musical

wands themselves, and GeminiPTE

helps refine their tone, adding richness

and harmonious resonance.

Mixing Magic: In the grand tapestry of

your mix, this mystical device can be

placed on the mix bus, acting as a

guardian of sonic cohesion. It imparts a

warm and analog-style glow that ties

all the musical elements together.

The perfect approach to

circuit modeling

GeminiPTE features the same built-from-

scratch proprietary 64-bit engine used

for SaturnLO, MercuryRec and

JupiterXTC which is based on general

purpose hi-quality algorithms and the

most recent non-linear models.

Particular attention has been put on

the definition of the Non Linear Solver

to get the maximum quality and

realism, without losing details in favor of

performances (Double-Precision Non-

Linear Computing).

Our non-plus-ultra reproductions bring

a completely new philosophy to the

table: being able to shape your tone

by giving total access to the circuit

components. Managing gain stages

and tube buffers, shaping the filters or

modifying the tubes characteristics:

there is virtually no limit to what you

can achieve with our plugins!

Double-Precision Non-Linear Computing

About (db)2

DiBiQuadro is the result of the joint

forces of two Italian Software Engineers

with more than 15 years of experience

in several industries including

Biomedical, Military, Insurance, Travel,

Telecommunications and Pro Audio.

Our purpose is to deliver superior results

in the Audio market with ground

breaking technology and exquisite

user-friendly graphic interfaces.

DiBiQuadro full logo

DiBiQuadro compact logo

GUI: tooltips and Edit

Mode

The graphic engine has been designed

with a purpose in mind: keeping a clear

indication of the status of the elements

without altering their 3D rendering on

the scene. Tooltips serve this purpose

perfectly especially when dealing with

knobs status. A typical approach to this

problem would be to compress the

height of the knobs trying to prevent

the user to commit parallax errors. As a

side effect the graphic designer would

be forced to take into account this

constraint by limiting the 3D depth of

the scene.

Another good reason to use a tooltip-

based approach is to allow the update

of the knobs status by using an Edit

Mode.

The tooltip approach

EDIT mode

When using a state-of-the-art system –

see minimum requirements in the

product webpage –the GUI is able to

deliver more than 60 FPS at a

reasonably low CPU usage for a super

fluid knob tweaking and a hyper

realistic meter response.

Controls

GeminiPTE is a dual channel unit. Each

channel has all the classic controls you

would expect from a classic passive

tube program equalizer, plus some

basic controls to simplify the gain

staging process and the routing:

In [dB]. This knob adjusts the level of the

signal entering the plugin. When TRIM

INPUT is enabled, the input level is

automatically compensated on the

output of the plugin, allowing the user

to quickly adjust the amount of

harmonic distortion generated by the

circuit simulation.

Input Phase. This switch inverts the

phase of the input signal, thus before

entering the circuit simulation.

Out [dB]. It adjusts the overall output of

the plugin.

Output Phase. It inverts the phases of

output signal.

LOW [Hz] (Low Frequency Selection).

This switch determines the frequency of

the low shelf portion of GeminiPTE. Six

frequencies are available: 20, 35, 70,

100, 150 and 200 Hz.

Low BOOST. This knob determines the

amount of low shelf gain to be applied

to the frequency set by the LOW

switch.

Low ATTEN. It determines the amount of

low shelf cut to be applied to the

frequency set by the LOW switch.

HIGH [kHz] (High Boost Frequency

Selection). This switch determines the

frequency of the high boost portion of

GeminiPTE. Six frequencies are

available: 2.4, 3, 3.6, 7.4, 13 and 18 kHz.

High BOOST. It sets the amount of gain

for the high frequency portion of the

equalizer.

BANDWIDTH. This knob is a Q control for

the High BOOST section. Higher values

yield a broader band.

ATTEN SEL [kHz] (High Cut Frequency

Selection). This switch determines the

frequency of the high cut portion of

GeminiPTE. Six frequencies are

available: 1.2, 1.9, 2.8, 4, 5.6 and 8.4

kHz.

Hi ATTEN. It determines the amount of

high shelf cut to be applied to the

frequency set by the ATTEN SEL switch.

SOLO. When enabled, it lets the signal

pass only through this channel, by

muting the other one.

In addition, GeminiPTE offers the

following set of general switches.

INPUT TRIM. It affects the behavior of

the Input knobs (Check In [dB] for more

details).

LINK.It links the controls of the 2

channels.

BYPASS. It bypasses the circuit

simulation.

ChannelMode. Three modes are

available:

M. Mono

L/R. Left/Right

M/S. Mid/Side

LOAD/SAVE. The LOAD button opens a

window to select a previously saved

preset –this includes knobs, buttons,

switches, SIZE, TWEAK and SET settings –.

The SAVE button allows to save a file

containing the current settings of the

plugin.

LOAD and SAVE windows

PREV/NEXT. Use these buttons to

browse back and forth through the

preset files.

SIZE. Press this button to load the

double sized graphic interface for 4K

monitors compatibility.

SET/TWEAK. Please refer to the

dedicated sections.

GUI useful tricks

Here some useful tricks to interact with

the GUI:

use “CTRL + click” on a knob to

reset the value to its default;

use the mouse wheel on a knob

for fine adjustments;

press SHIFT while moving a knob

to fine adjust.

(Windows OS only) Right click

with your mouse on the GUI to

choose between 2 different GUI

sizes (“Normal”and “Full”):

GuiSize window

Edit Mode

The Edit Mode is accessible by double

clicking on a knob. Once done, you

can edit the value by using arrows,

digits and “.”, “+”, “-” keys. INSERT key is

supported too: INSERT status is

recognizable by checking the cursor

inside the tooltip (“|” means INSERT

disabled, “_” means INSERT enabled).

After modifying the value press ENTER

to commit or ESC to roll-back to the

latest value set before accessing the

Edit Mode.

SET

SET window

You can open the SET window to

access the configuration settings for

meters, ReSampler and PreRender.

RESET. It restores the default values for

all configurations in the SET window.

LEDs. It activates / deactivates the

meter LEDs.

RealTime and OffLine tabs. These tabs

allow the user to specify different

configurations for the ReSampler, which

are taken into account depending on

the current processing mode.

RealTime tab. These ReSampling

settings are applied by your DAW

when playbacking tracks through this

plugin. It provides two modes: “Simple”

which allows the selection of pre-

defined profiles, and “Advanced”

which gives you full control on all

ReSampling parameters. With the

default settings (“Simple” Mode and

“HighLatencyHighQuality” Profile) an

UpSamplingFactor of 4x at

44100/48000Hz, of 2x at 88200/96000Hz

is applied. This can be considered more

than enough for the majority of the

applications.

OffLine tab. This mode is set by your

DAW when bouncing a track or the

complete mix. If the elaboration time is

not a constraint for you and you are

cranking the input up, we suggest to

set the UpSamplingFactor to at least

128x @ 44100/48000Hz, 64x @

88200/96000Hz in order to minimize the

aliasing artifacts and get super high-

quality harmonic distortion.

ReSamplerBufferSize. This is the

ReSampler Buffer Size in number of

samples.

UpSamplingFactor. This is the

UpSampling Factor applied to the base

input SampleRate. Use it to increase the

quality or your playbacks and renders,

but take into account that high

UpSampling factors correspond to

more samples to be processed, and

consequently longer processing times.

UpFilterTransBand. This is the

UpSampling Filter Transition Band, in

percent of the spectral space of the

input signal between filter's -3 dB point

and the Nyquist frequency.

UpFilterType. It defines the UpSampling

filter's phase response: Minimum Phase

or Linear Phase.

DownFilterTransBand. This is the

DownSampling Filter Transition Band, in

percent of the spectral space of the

output signal between filter's -3 dB

point and the Nyquist frequency. If you

are working at sample rates higher

than 44100/48000Hz, we suggest to

increase it to 43% to have a smoother

low pass filter and to reduce the

latency without impacting the audible

frequencies.

DownFilterType. It defines the

DownSampling filter's phase response:

Minimum Phase or Linear Phase.

PreRenderFactor. Together with input

SampleRate and UpSamplingFactor,

PreRenderFactor affects how many

samples will be pre-rendered by the

model before the real processing. We

suggest to set it to the highest value –

32x –in Offline mode.

DONE. It closes the SET window.

TWEAK

TWEAK window

The TWEAK window gives you the

power to modify every single

component of the circuit. Even the

Triode model of the 6DJ8/ECC88 can

be tweaked in the NonLinearSolver tab.

Play with this window very carefully,

possibly in front of an analyzer, to get

exactly what you are looking for. We

do not guarantee that any possible

combination of values makes sense, so

it’s up to you to find a configuration

that works and satisfies your needs.

RESET. It restores the default values for

all configurations in the TWEAK window.

Tolerance. This feature can be used to

apply random variations to each

component of the channel circuits. You

can increase or decrease the

percentage deviation (default value:

5.0%) and apply it separately to the

passive sections with “ApplyToPassive”

(HiBoost, HiCut, LoBoost, LoCut) or to

the tube section (“ApplyToActive”).

When checked, “AutoReset” always

resets each component of both

channel circuits to its default value

before applying the random variation.

Primary tabs: L/M, R/S and

NonLinearSolver. The primary tabs

provide access to the different

channels of GeminiPTE and to the

triode model. Each channel can be

tweaked independently or at the same

time depending on the state of the

“LINK” button in the GUI, while there

can be only one triode model for all

triodes in the circuit simulations.

Secondary tabs: HiBoost, HiCut,

LoBoost, LoCut, Active. They provide

access to the different sections of the

circuit.

TWEAK window –NonLinearSolver tab

NonLinearSolver tab. Use this section to

change the characteristics of the

triodes in the channels. The easiest way

to tweak the triode characteristics is to:

1. Modify the name in the DtpFile

textbox.

2. Change one or more parameters

of the triode model

3. Press GENERATE button.

DONE. It closes the SET window.

Take a look at https://www.dafx.de/paper-

archive/2011/Papers/76_e.pdf for more details.

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