LFE-S provides 5 DSP physical modeled oscillators at 32 bits resolution and 2 noise generators.
Osc
1 can be switched on different simple waveform or a can be switched
as input source for processing of external signals.
Osc 2 provides Saw, Pulse with phase swift
and a Square osc with pulse modulation. Both are summable independently at
their output stage before routing.
Osc
5 is a pure sine oscillators with fine tune resolution.
Noise generators are full band white noise
and band passed noised. Both are independently summable and routable. All
oscillators can be octave shifted up or down at semitone resolution while,
beside sine osc, a fine tune is provided common for saw, pulse and square
osc. An independent level is provided for each oscillator as well.
Each oscillator can be routed as follow:
Osc 1-2 and osc 2-3 can be shaped modulated (sync) independently.
Osc 1,2,3 and the sum of the 2 noises (4) can be routed as modulator source of a sine career in the FM synth module (see later on the FM section).
1,2,3 and 4 can be routed to one or both of the LFE modulator (see later LFE section).
Each oscillator beside the above Assignment will be also routed to the filter section and then to the synth out stage (see later filter and mixer section). Except for the full noise generator that can be excluded by the out synth stage (pre switch).
The FM section is composed by a Career and a Modulator.
-Career
is a sine generator and you can choose freq coarse, fine, detune and level.
- Modulator
is the sum of the assigned oscillators and noise. Each has its level control,
it can be ring modulated and can be assigned to envelope 2. The result of
this added synthesis is the actual modulator. Such FM element act as an independent
added oscillator and can be routed at this point at one ore both the LFE modules
(see LFE section later). Vu meters constantly monitor the data flow of the
modulator versus the career.
The modulation section provides 2 independent LFOs with sine, square, saw up and down, triangle and S&H waveforms. Gain, delay fade in/out and retriggering are also provided for both LFOs.
2 independent envelopes are assigned to VCA (env 1) or to pitch, filter or FM modulation (env 2).
The Modulation section allows you to assign Filters, FM, Pitch and VCA to LFO 1 or 2 and /or env 2.
Beside the fact that any parameter is MIDI controllable, a dedicated section is included for complex MIDI mapping and real time control of the LFE-S.
All
oscillators and FM are splitted between the LFE modules and the Synth output.
The sum in the synth output passes throught the Filter section that provided
a 24 dB Low Pass filter a 24 dB Hi pass filter and a common resonant Q.
The
filter section does not affect the LFE input stage, since the LFE modules
have their own 96 dB LPF.
The output stage of filters section is directly
routed to the VCA section that is controlled by env 1 and than to its independent
level (see mixer section).
This
is a specialized version of the LFE section included in the Matrix module.
The LFE processor is based on a dedicated algorithm based on Tartini’s 3rd
sound developed by Helmotz resonances law were sub harmonics are generated
processing multiples of the differences of a chosen existing frequency. In
this way you will get lower frequencies at the speaker that are beyond the
speaker frequency range.
In the LFE-S the algorithm modulates the resonances generated toward the slowest
cycles supported by the DSP clock.
The 32 bit resolution allows to address the added harmonics in the lowest
frequency range generally handled by subwoofers in professional systems (see
Warning section at the beginning).
This section provides 2 independent LFE processor where you will choose the basic frequency to be processed and with the level you will adjust the amount of gain process.
The
LFE Synth provides 2 independent output stages. The
Synth Stage and the LFE stage.
Synth stage accumulates all the synthesis (osc sum, FM, shape modulation,
filter subtractive etc.) while the LFE provides the routed elements (pre filter)
to the LFE section.
The 2 signals are then added with their relative levels in the Balance section
and then routed to the module’s output.
There is also an input level trim that control the input amplifier of osc
1 when external source is selected instead of one of its internal waveforms.
All
the summing stages that occurs in the module signal path are phase correlated
and normalized to avoid internal clipping. By the way clipping may occur due
to intermodulated harmonics that may occur at LFE. The LFE meters allow to
watch for modulation clipping.
The
LFE-S is highly DSP consuming and it’s intended to be used monophonically
for Sub-Woofer fxs.
Anyhow it’s possible to use it polyphonically as well: in this case the number
of simultaneous voices depends by the number of DSPs operating in the board.
When used polyphonically the LFE-S physically doubles all its components (filters,
LFOs, etc.) so that you will get maximum performance and flexibility.
This tool is designed for professional use and for this reason we choose to demand for more DSP power in order to get better quality generation and wide dynamic range.
Like Matrix this module has not been fully explored and more and more of its applications (like music, real time composition, sound reinforcement etc.) are now in progress.
