X

EFFECTS MENU 713
to the resistance result in a change in the amplification factor of the entire circuit
(controllable voltage divider). The light source is fed from the output instead of the input
due to historical, practical reasons: the circuit gently oscillates to the signal and is very
stable without additional settings, and operates very musically so that in hardware reality,
this type of device can be built with a minimum amount of required components (which
improves sound quality). Due to the overall lag of the opto-coupling system, optical
compressors have a relatively sluggish release reaction. This is accompanied by the so-
called memory effect of the opto-coupler.A longer exposure to light also means longer
return times. Due to the feedback control, the control times and compression ratio also
highly depend on the control times, and the compression ratio strongly depends on the
input signal.
Specify whether you want to tap the feedback signal after the gain stage or the second
filter. Frequency-dependent compression can also be achieved in combination with the
pre-filter stage.
The compressor may also be
switched between compression and
limiter.
Note that the ratio of program regulation depends on the program.
AM-Phibia – 3) prefilter
Different types of EQ are available.
Each is treated as an independently
structured circuit.
- active A/B
This is an emulation of an analog filter module that operates via positive and negative
feedback loops. In this case, A and B differ from one another in terms of the input
frequencies of the bands. B is optimized for use with speech or singing.
- passive A/B
This circuit corresponds with the classic Baxandall network and is comparable to stereo
systems and some guitar amps. Type A and type B differ slightly; the bass and highs are
spaced out further spectrally for type A, and the mid range is more extensive for type B.
Variant A is intended for general applications, filter B is optimized for vocals. The mid range,