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THRESHOLD

— Variable hysteresis is incorporated in the Threshold circuitry. For any given ‘open’ setting, the

Expander/Gate will have a lower ‘close’ threshold to prevent ‘hunting’ artifacts. The hysteresis value is automatically
increased as the Threshold is lowered. This is very useful in music recording as it allows instruments to decay below
the open threshold before gating or expansion takes place.

REL/HOLD

— This determines the time constant (speed), variable from 0.1- 4 seconds, at which the

Gate/Expander reduces the signal level once it has passed below the threshold. Note that this control interacts
with the Range control. This control also incorporates a switch which, when pushed, provides a fast attack time
(100µs per 40db), instead of the normal linear attack time of 1.5ms per 40dB. The attack time is the time taken for
the Expander/Gate to ‘recover’ once the signal level is above the threshold. When gating signals with a steep rising
edge, such as drums, a slow attack may effectively mask the initial THWACK, so you should be aware of this when
selecting the appropriate attack time.

HOLD

— When this button is pressed, the release time is fixed at 150ms but the hold time can be varied between

0 and 4 seconds by adjusting the

REL/HOLD

pot.

The

LINK

button in the compressor section links the sidechain signal of that unit to the sidechain of the next

dynamics section to the right. When two dynamics sections are linked, the control voltages of each section sum
together, so that whichever section has the most gain reduction will control the other section.

Don’t try to link two gates using the

LINK

button when you want the signal on one to open the other. If you need

to achieve this effect, take a keying signal from one section to trigger the other. The easiest way to do this is by
patching from the insert send of the ‘source’ channel into the Key input (see below) of the ‘destination’ channel, and
selecting the

KEY

button on this channel.

The

KEY

button feeds whatever signal is present on a channel’s Key input (D-connector) into the sidechain input

of that channel’s dynamics section. Pressing

S/Ch LSTN

routes the sidechain signal to the console’s PFL bus. This

simplifies the set up when either an external key input or the filters to side chain option is in use.

POST EQ

(not surprisingly) places the dynamics section post the EQ section (see also

Central Dynamics

Control

below.

Note that when the dynamics section is not in circuit, its sidechain input is also bypassed.

Signal processing order is graphically displayed on the channel TFT screen

Central Dynamics Control

The centre section master routing panel replicates the dynamics

POST EQ

function for sweet spot control and

multiple channel operation using the

SELECT/TO

range keys.

Dynamics Section Metering

The TFT screen above each bay of six channel strips is used to display a wide variety of relevant information. In its
default Channel mode, as well as channel output metering (see later) a display of dynamics section gain processing
is shown, in the form of two columns of indicators — yellow and red for the compressor, green for the gate/expander.
See

Channel Metering

for more information.

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