User Manual

ALF-DSP 88-U
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(1) Main (Global) control parameters
Click the ON / OFF button to turn the auto mixer on or off.
Gain: Controls the main output volume of the auto mixer
Slope : The slope control influences the attenuation of lower levels. If the slope is high, the
attenuation of lower-level channels will rise. The slope control and the ratio control at the
expander has the same working mode. It is suggested that the value be set at or around
2.0. If it is set at 1.0, the effect is equal to closing the auto mixer at all channels. If it is set
at 3.0, the action will result in larger gain adjustment, which may bring unnatural volume
levels. The bigger the value, the more the channel is opened and the
more the total
attenuation. When the slope is set at 2.0, ideal gain sharing may be realized, so it is the
preferred value to use.
Response Time: Faster response time may ensure that the first letters of spoken words are
not cut off. Slower response time allows smoother operation. Practice shows that the best
effect will be produced when response time is between 100ms and 1000ms. The design of
auto gain aims for faster microphones switching. The ref ore , first letters of spoken word will
not be cut off even if the response time is set to 100ms. If it is set at several se conds, then
there will be a longer hold time of the response time of the au to mixe r, previous active
channels will be saved at open status for several seconds.
(2) Channel control parameters
Auto Mixer: Each channel has an auto mixer on / off button which must be turned
on for that channel to participate in the auto mixer. When in Off mode, that
channel will not participate in the auto mixer.
Mute: Both the channel mute and volume fader are post the auto gain processor. If
the channel level is higher, the level gain of other channels may also be reduced
even if the channel mute is on.
Gain: The Gain fader adjustment may increase / decrease the volume amount of
that channel in the auto mixer.
Priority: Priority settings may give priority treatment to high priority channels ove r
low priority channels, and therefore the auto mixer algorithm will be affected
accordingly. Priority ranges from 0 to 10. The higher
the value, the higher the
priority.
Both the channel mute and fader are post auto gain. Any adjustment made towards these two parameters won’t
influence the operation of the auto mixer. For example, If the channel level is highe r, the level gain of other
channels may also be reduced even if the channel mute is on. Channel mute must be turned on and the auto mixer
shall be turned off to set signal mute and prevent its influence on the auto mixer. The mute button at each channel
and directly controls output mute when mixing sound. Channel faders also control sound mixing level and direct
output level of channels. Click the textbox and input a dB value to control channel level precisely.
Priority control allows high priority channels to override low priority channels, and thus the auto mixer algorithm
will be affected. Priority value can be set from 0 (the lowest priority) to 10 (the highest priority), and the default
value is 5 (standard priority). Users may use the slider or click the textbook to input a specified priority between 0
and 10. Increasing the value means increasing priority.