Mackie Digital 8 Bus Owner's Manual page 131

Decay: This adjusts the amount of time that
reflections continue to propagate. A "live" room
will have a longer decay time than a "dead" room.
It is calibrated in seconds (S), with a range from
1.1 seconds to 2.2 seconds.
PreDelay: This adjusts the amount of delay be-
tween the dry audio signal and the start of the
wet reverberant signal. Adjusting this control can
provide better separation and definition to the dry
signal. It is calibrated in milliseconds (mS), with
a range from 0mS to 299mS (0.3 seconds).
Damping: This control causes the higher
frequencies to roll off faster than the low
frequencies. The higher the damping setting, the
faster the high frequencies roll off. This is a unit-
less measure, with a range from 0 to 10.
Diffusion: This controls the increase in echo
density over time in the reverberant signal. The
higher the diffusion setting, the higher the echo
density. This is a unit-less measure, with a range
from 0 to 10.
Rolloff: This adjusts the cutoff frequency for
rolling off the entire reverberant signal. This is
different from the damping control which rolls off
only the higher frequencies over time. It is cali-
brated in Hertz (Hz), with a range from 500Hz to
20kHz. It also has a Flat position, which by-
passes the control.
Mono Delay
The mono delay effect provides an adjustable
delay, which is returned to the left and right ste-
reo effect return. It also provides an adjustable
feedback path for a multiple echo effect. The
mono delay has the following controls:
Delay: This adjusts the amount of time be-
tween the original signal and the delayed signal.
It is calibrated in milliseconds (mS), with a range
from 0mS to 1599ms (1.6 seconds).
Feedback: This adjusts the amount of signal
that is fed back to the input of the delay. It is cali-
brated in percent, with a range from 0% to 99%.
Rolloff: This adjusts the cutoff frequency for roll-
ing off the feedback signal. It is calibrated in Hertz
(Hz), with a range from 500Hz to 20kHz. It also
has a Flat position, which bypasses the control.
Stereo Delay
The stereo delay effect provides independently
adjustable delays which are returned to the left
and right stereo effect return. It also provides an
adjustable feedback path for a multiple echo ef-
fect. The stereo delay has the following controls:
Left and Right Delay: This adjusts the amount
of time between the original signal and the de-
layed signal. It is calibrated in milliseconds (mS),
with a range from 0mS to 799ms (0.8 seconds).
Notice that the stereo delay effect has precisely
one-half the amount of delay available per chan-
nel as the mono delay.
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Starting a New Session
Left and Right Feedback: This adjusts the
amount of signal that is fed back to the input of
the delay. It is calibrated in percent, with a range
from 0% to 99%.
Rolloff: This adjusts the cutoff frequency for roll-
ing off the feedback signal. It is calibrated in Hertz
(Hz), with a range from 500Hz to 20kHz. It also has
a Flat position, which bypasses the control.
Ping Pong
This effect is the same as stereo delay, with
the exception that the left feedback is directed to
the right delay input, and the right feedback is
directed to the left delay input. In this way, the
delayed signal (echo) bounces back and forth be-
tween the left and right channels.
Chorus
The chorus effect generates a mono or stereo
simulated chorus of voices. It has the following
controls:
Depth: This adjusts the depth of the chorus
modulation for all the voices. It is calibrated in
milliseconds (mS), with a range from 0mS to
10.0mS.
Delay: This adjusts the amount of time be-
tween the original signal and all the generated
chorus voices. It is calibrated in milliseconds
(mS), with a range from 0mS to 100mS.
Thicken: This defines the number of delay
taps used to generate the chorus effect, and how
they are distributed across the left and right
channels. There are four settings:
0 = one mono voice
1 = one stereo voice
2 = two stereo voices
3 = three stereo voices
Speed: This controls the rate of the chorus
modulation, and applies to all voices. It is cali-
brated in Hertz (Hz), with a range from 0.1Hz to
10.0Hz.
Waveform: This defines the waveform that is
used for modulating the voices. There are three
settings, including sine, triangle, and random.
The random setting applies random sine/triangle
waveforms to each voice independently.
The Digital 8•Bus also comes with a library of
effects settings (patches) stored on the hard
drive that can be readily selected. Additional
plug-in effects will become available.
Only one effect can be assigned to each internal
effects bus. Aux 1 is routed to the Internal Effects 1
bus, and is returned to the L-R bus via the FX 1 and
FX 2 faders in Fader Bank 3. Aux 2 is routed to the
Internal Effects 2 bus, and is returned to the L-R
bus via the FX 3 and FX 4 faders in Fader Bank 3.
If additional DSP cards are installed, this pattern is
repeated for up to eight internal effects buses and
sixteen effects returns.