Apollo Thunderbolt Software Manual Latency & Apollo 182
Effect of Console’s IDC setting
In Console
In Console, the amount of delay added by the IDC engine is automatic. Only the
minimum amount of delay actually required to compensate the input(s) is applied (up
to the maximum value of the setting), maintaining the lowest possible latency for phase
alignment at all times.
For example: When the IDC value is Short (100 samples – the default value) and only
31 samples is actually required to compensate, then only 31 samples of delay will be
applied to the other Console inputs.
In the DAW
In the DAW, the amount of delay added by Console’s IDC
engine is static. The extra samples are always added to
all inputs in the DAW, even if no upsampled plug-ins
are active. However, this overall additional input latency
is reported by Apollo’s drivers, so it is automatically
compensated by the DAW’s ADC.
For example: When the IDC value is Short (100 samples – the default value) and only 31
samples is actually required to compensate, 100 samples is still added to all inputs in
the DAW. If using software monitoring via the DAW, the extra (unnecessary) delay could
be detected.
Note: By default, Console Input Delay Compensation is enabled with the Short
value (100 samples).
Software monitoring with Console IDC
When software monitoring via the DAW and Console IDC is enabled, the lowest effective
Console IDC setting is recommended to minimize monitoring latency. If using Console
for monitoring and software monitoring via the DAW is disabled, the IDC value isn’t as
critical because Console will dynamically deliver the lowest possible monitoring latency.
UAD-2 DSP Resources
Console IDC uses a small percentage of Apollo’s UAD-2 DSP. To maximize DSP resource
availability for UAD plug-ins, disable Console IDC if it is not needed.
Special Cases: Precision Multiband, Ampex ATR-102, and AKG BX 20
These three UAD plug-ins have extra latency values that exceed the capacity of Console’s
IDC engine even at the maximum setting (Long). These plug-ins are designed to be used
on outputs of a DAW during mixdown, where latency is not a consideration. If using these
plug-ins in Console, the Input Delay Compensation feature may need to be disabled or
ignored.
Input Delay Compensation Values
Setting Name Extra Delay (samples)
Off 0
Short 100
Medium 200
Long 1000
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