5 – Channel modules : Dynamics processors
76
TASCAM DM-4800
User’s Manual
Gates (input channels 1–48)
GATE
This is an on-screen button, allowing you to
turn the channel gate (1 through 48, inputs only) on
and off. Duplicated in the global section at the right
of the screen.
Threshold (
THRESH
)
, controlled by the POD 1
knob, allows the setting of the threshold at which the
gate will open. Variable from
-80dB
to
0dB
in 1dB
steps.
Range (
RANGE
)
, controlled by the POD 2 knob,
sets the gate range, from
60dB
to
0dB
in 1dB steps.
Gate attack time
(
ATTACK
), controlled by the
POD 3 knob. Variable from
0ms
to
125ms
in 1ms steps.
Hysteresis (
HYST
)
, controlled by the POD 4 knob,
from
0dB
to
24dB
in 1dB steps.
NOTE
Hysteresis is a second threshold. The
Threshold
value is
used when opening the gate, and that of
Hysteresis
, typ-
ically set a few dB lower than
Threshold
, when closing
the gate. This means that once a signal has dropped
below the
Hysteresis
level, it must rise again to the
Threshold
level for the gate to re-open, thus reducing or
eliminating gate “chatter”.
Gate hold time (
HOLD
)
, controlled by the POD 3
knob on the second row. Variable from
0ms
to
990ms
in
100 steps.
Gate decay time (
DECAY
)
, controlled by the
POD 4 knob on the second row. Variable from
5ms
to
5.0s
.
Compressor/expanders
COMP/EXPAND
This is an on-screen button,
allowing you to turn the channel compressor/
expander on and off. Duplicated in the global section
at the right of the screen.
Insert point (
INS PNT
)
allows the compressor/
expander to be inserted either pre-EQ or post-EQ
(channels 1 through 48—buss, aux and stereo are
pre-fader only). Move the cursor to this field and use
the
ENTER
key to change this setting.
The link and trigger settings work in the same way as
for the gate (see above).
Threshold
(
THRESH
), controlled by the POD 1
knob, and variable from
-48dB
to
0dB
in 1dB steps.
Compression/expansion ratio
(
RATIO
), con-
trolled by the POD 2 knob, and variable from
1:1
to
∞
:1
(infinite compression).
The steps are as follows:
1.00:1
,
1.05:1
,
1.11:1
,
1.18:1
,
1.25:1
,
1.33:1
,
1.43:1
,
1.54:1
,
1.67:1
,
1.82:1
,
2.00:1
,
2.22:1
,
2.50:1
,
2.86:1
,
3.33:1
,
4.00:1
,
5.00:1
,
6.67:1
,
10.0:1
,
20.0:1
,
∞
:1
.
When the processor is used as an expander, the val-
ues are
: 1.00
,
2.00
,
4.00
,
8.00
,
16.0
,
32.0
,
64.0
.
Attack time
(
ATTACK
), controlled by the POD 3
knob, and variable from
0ms
to
125ms
in 1ms steps.
Release time
(
RELEASE
), controlled by the POD 4
knob, and variable from
5ms
to
5.0s
in 100 steps.
Auto make-up
(
AUTOmk-up
), controlled by the
ENTER
key. This is used if the compression settings
have resulted in gain reduction. Not shown if the pro-
cessor is being used as an expander.
Decay time
Step size
5ms to 200ms
5ms
200ms to 300ms
10ms
300ms to 500ms
20ms
500ms to 1.00s
50ms
1.00s to 3.00s
0.1s
3.00s to 5.00s
0.2s
Table 5.2: Gate decay times
Release time
Step size
5ms to 200ms
5ms
200ms to 300ms
10ms
300ms to 500ms
20ms
500ms to 1.00s
50ms
1.00s to 3.00s
0.1s
3.00s to 5.00s
0.2s
Table 5.3: Compressor/expander release times
