| Live mixing
in the digital domain
By Lon Brannies |
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Live mixing on a small format
digital mixer - what a scary thought at first glance. But
what is different about it? All the same tools from the analog
world are there: routing, gain setting and equalization. Then
DSP and memory are added to make life easier - maybe this
is doable.
On the down side, there are gain structure issues to deal
with, since input/output connections are still made analog,
mostly.
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Won't that +4/-10 thing ever go away? The stickiest gain structure
problem, processor inserting, does vanish because it is now digital
with the DSP.
Hallelujah! Where is it best used?
From the university of hard knocks, research, user comments, has
shown them to be useful for the small church, arbitrarily defined
as less than 200 seats, and the large church, again, arbitrarily
defined as more than 1200 seats.
The small church, maybe
still renting space in a shopping center, just has a few mics and
no operator that can mix audio at all. So, the pastor wants a good,
easy to operate mixer, with very few buttons and knobs, which will
grow with the church.
The large church already has a large
format analog mixer with a good operator. The issue there is that
special music (concerts or Christmas and Easter pageants) is now
so complicated that the operator needs automation help for choir
or orchestra or wireless mic submixes during these events.
Where
should it be avoided? From the same previous research institution,
the mid-size church does not do very well with the small format
digital mixer. That church needs a traditional analog device. More
inputs, and usually more buses, are needed than are available on
the digital units.
How hard is it to actually mix on a digital
mixer? Push up a mic channel fader and the master fader and audio
is up for that mic. That's as easy as anything that is out there.
Now it gets more interesting. To pan the channel, touch
the select button for the channel, then adjust the pan knob to the
right of the display. The display shows the setting. To equalize,
touch the select button for the channel, then adjust the frequency
and gain knobs to the right of the display for each of the four
bands. The display shows the setting. If you are unsure of where
to set the equalization, call up an equalization library pre-set
for the channel and go from there.
Pro level equalization
work from church volunteers; problems with over equalizing just
went away. So now, a compressor is needed for the mic input. First,
touch the select button for the channel then touch the dynamics
button to the left of the display. If you don't see the dynamics
library pre-sets, touch the dynamics button again and recall the
type of processor needed. Touch the dynamics button again and make
parameter adjustments as required. The display shows the setting.
And now a delay is needed for another input. First, touch the select
button for the channel; then touch the delay button to the left
of the display. If you are don't see the delay settings for that
channel, touch the delay button again. Turn on the delay with the
enter button and use the parameter wheel to set the delay time.
Move the cursor in the screen with the four cursor keys near the
wheel.
How much DSP power is available? For each input channel,
repeat each setting step for pan, equalization, delay and dynamics.
All can be on with different parameters for each channel. So now,
a few monitor mixes could be useful.
So, touch the aux1
button to the left of the display - watch out for the servomotor
driven faders. Set up the first monitor mix as needed and use the
stereo master fader for the aux master. Now repeat for each of the
other three aux buttons - four monitor mixes total.
And
now, a little reverb, to sweeten the mix for a dry room, would be
handy. Touch the effects1 button to left of the display - watch
out for the servomotor driven faders. Set up the first effects mix
as needed and use the stereo master fader for the effects master.
Now repeat for the other effect button - two effects mixes total.
To recall a reverb or another effects program, touch the
effects button again for the effects library. The reverbs are returned
to the mix through separate dedicated inputs so the relative wet
and dry mix is easily controlled. So the perfect mix is finally
finished, how can it be saved and used as necessary? Scene memory
is useful for this purpose. Any parameter that can be adjusted on
the mixer, except for mic preamp gain and attenuation, can be stored
in a scene memory. That memory can then be recalled as required.
Usually, a good number of scenes, 100 or more, can be stored
at one time. A fade time can be set to control fader movement during
scene recall.
So, that's it. It is different. A new thought
process has to be learned. There is usually an intermediate step
that is necessary, but it ends up operating just as fast as analog
with many capabilities analog cannot match‹even with an unlimited
budget.
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