Setting Up The Processing
27
High return to platform speed factors essen-
tially freeze the AGC when gated
Gain reducing during gating caused by the
return to rest level being set to a low figure
(-20dB in this example)
Gain increasing during gating caused by the
return to rest level being set to a high figure
(-4dB in this example)
The effect of return to rest platforms and speeds
AGC attacking and decaying with faster time
constants
AGC attacking and decaying with faster time
constants but gating enabled
The effects of gating
AGC attacking and decaying with faster time
constants
AGC attacking and decaying with slower time
constants
The effects of time constant speeds
this manual as 'forced gating' as it has the effect of switching the gate on at all times with any level of program
material. This option is used to bypass the AGC and provide a fixed gain through it. The fixed gain (in dB) being
that of the (input drive plus 12) minus the level in dB that the return to rest level is set at. Setting the input drive
to 0dB and setting the RTR (return to rest) level to -12dB would set the AGC to unity gain bypass ((0+12)-12)dB
= 0dB gain.
We mentioned the return to rest level. This is the level that the gain reduction will move towards under gated
conditions. The options are -4dB, -8dB, -12dB, -16dB, -20dB and AUTO. If in doubt set the control to the near-
est setting that represents the average level of gain reduction you usually see in the AGC. The AUTO option is
another one worth considering. It takes the rolling average of the last 30 seconds of gain reduction and heads
to that position under gated conditions. The last option that affects the silence gating is the return to rest speed.
This is the speed at which the AGC moves towards the return to rest level at. This control does not have actual
speeds but numbers that represent scaling factors. The RTR speed control lets you modify the current attack or
decay rate by slowing it down by the factor set in the RTR speed setting. The options are 1, 2, 4, 8, 16 and 32. 1
keeps the speed the same as the respective attack or decay and each higher setting slows the rate down by the
factor of the setting. For example a decay time of 4 seconds would be slowed to 32 seconds under gated condi-
tions if the return to rest speed was set to 8. Higher settings are similar to freeze controls in other processors.
