Digi XPress Specifications download pdf (Page 79)

Chapter 6: DigiRack Real-Time TDM and RTAS Plug-ins 73

Threshold

The Threshold control sets the level below

which an input signal must fall to trigger expan-

sion or gating. Signals that fall below the thresh-

old will be reduced in gain. Signals that are

above it will be unaffected.

An orange arrow on the Input meter indicates

the current threshold, and can also be dragged

up or down to adjust the threshold setting.

The Dynamics Graph display also shows the

threshold as an orange vertical line.

This control has an approximate range of

–60 dB to 0 dB, with a setting of 0 dB equivalent

to no compression or limiting. The default value

for the Threshold control is –24 dB.

Ratio

The Ratio control sets the amount of expansion.

For example, if this is set to 2:1, it will lower sig-

nals below the threshold by one half. At higher

ratio levels (such as 30:1 or 40:1) the Ex-

pander/Gate functions like a gate by cutting off

signals that fall below the threshold. As you ad-

just the ratio control, refer to the built-in graph

to see how the shape of the expansion curve

changes.

This control ranges from 1:1 (no expansion) to

100:1 (gating).

Attack

The Attack control sets the attack time, or the

rate at which gain is reduced after the input sig-

nal crosses the threshold. Use this along with

the Ratio setting to control how soft the Ex-

pander’s gain reduction curve is.

This control ranges from 10 μs (fastest attack

time) to 300 ms (slowest attack time).

Hold

The Hold control speciﬁes the duration (in sec-

onds or milliseconds) during which the Ex-

pander/Gate will stay in effect after the initial

attack occurs. This can be used as a function to

keep the Expander/Gate in effect for longer pe-

riods of time with a single crossing of the

threshold. It can also be used to prevent gate

chatter that may occur if varying input levels

near the threshold cause the gate to close and

open very rapidly.

This control ranges from 5 ms (shortest hold) to

4 seconds (longest hold).

Threshold arrow on Input meter

Threshold indicator on Dynamics Graph display

Threshold

arrow

Threshold

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