Symetrix 528 - Usinir Reverb or Effects; Vocal Processinir - Recordinir and Reinforcement

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When unwanted signals trigger the system, it's often possible to eliminate the false
triwering by equalizing the control signal.
For example, if low frequency signals transmitted through a desk or podium are triggering
the 528's expander unnecessarily:
• With an equalizer in the sidechain, remove the
low frequencies from the control signal,
and/or
• Boost the higher voice range frequencies .
When the offending frequencies are removed, and the relative level of the desired
frequencies is increased, the expander can tell the difference between the wanted and
unwanted signals. Use this technique in any situation where levels are nearly the same,
but the fundamental frequencies involved are different.
NOTH
The ability of the expander to discriminate between wanted and
unwanted signals is determined in part by mic technique . Be
particularly careful of high frequency sounds entering the side or
rear pattern of a cardioid mic. Most cardioids exhibit a sharply
rising off-axis response characteristic at higher frequencies . Check
the off-axis curve (the lower one) in the manufactur~r•s literature.
If there's only a 3d8 to 6dB difference between the on-axis (front)
response and the off-axis (side or rear) response in the SkHz to
lOkHz region, high frequency sounds will be picked up by the side
or back of your mic.
Use the mic's directional pattern to keep other sources as far off-
axis as possible - do everything you can to extract all the source-
to-source discrimination possible through good mic technique. The
sounds picked up by individual mies must be primarily the sound of
the the desired signal, or the expander won't be able to tell the
difference.
4.9 Using Reverb or Effects
Effects usually require another mixer input for effects return. However, the 528's
patching connections can be used to feed a signal to the effects unit, and the STACKING
INPUT can be used to return the effects signal to the 528's output. The only requirement
is that the effects device have an input or output level control to set the direct/ effects
signal mix .
4.10 Vocal Processing - Recording and Reinforcement
The 528 handles a wide variety of program material with ease. When recording vocals,
the undesirable side effects that usually result from high ratio comp / limiting, like
headphone leakage and room noise, can be reduced with the 528's interactive expander
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