MOTU 24Ai, Руководство пользователя

Страница: 63 / 92

CHAPTER
63
8
Mixer Effects
OVERVIEW
This chapter provides further information about
the effects processors available in the DSP mixer in
your MOTU AVB interface. For basic mixer
operation, see:
Mixing tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Aux Mixing tab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mixer input channel strips . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Main Mix and Monitor channel strips . . . . . . . . . . . . . . . . 20
Aux bus channel strips. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Group and Reverb channel strips . . . . . . . . . . . . . . . . . . . . 22
Powerful DSP-driven mixing and effects
The mixer is driven by a powerful DSP that delivers
32-bit floating point precision and plenty of
processing bandwidth for no-latency effects,
including parametric EQ, dynamics, and reverb.
Effects can be applied when operating as an audio
interface or as a stand-alone mixer without a
computer. Input signals to the computer can be
recorded wet and/or dry, or recorded dry while a
real-time wet monitor mix is sent to musicians.
Effects include:
High Pass Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
A conventional high pass filter
Gate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
A standard gate with threshold/attack/release
controls
Four-band parametric EQ. . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Multi-band parametric EQ modeled after British
analog consoles
Compressor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
A standard compressor with threshold/ratio/
attack/release/gain controls
Leveler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
The Leveler™, an accurate model of the legendary
LA-2A optical compressor, which provides
vintage, musical automatic gain control
Reverb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Classic reverb with tail lengths up to 60 seconds
Advantages over host-based mixing and
processing
The hardware mixer in your MOTU AVB interface
provides several major advantages over mixing and
processing in your host audio software:
■
No buffer latency. The DSP-mixer provides the
same near-zero latency throughput performance as
a conventional digital mixer. Effects processing
doesn’t impact your computer’s CPU.
■
DSP mixing and routing can be maintained
independently of individual software applications
or projects.
■
DSP-driven mixing can function without the
computer, allowing your MOTU AVB device to
operate as a portable, stand-alone mixer with
effects.
☛
Effects are disabled when operating at 4x
sample rates (176.4 or 192 kHz).
HIGH PASS FILTER
All input channel strips provide a 12 dB per octave
high pass filter. High Pass filters are often used to
remove unwanted mic rumble, for example.
Figure 8-1: The High Pass Filter.