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HD 192/Apogee X delay issues
Old 19th June 2005
  #1
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Unhappy HD 192/Apogee X delay issues

apparently the Digi 192 interface has more delay than the Apogee X series. if both Digi and Apogee interfaces are used on the same system, one needs to compensate manually, as in the example below. my question is, if only Apogee DA-16X and AD-16Xs are used, how to deal with the delay issue? does ADC in PT make the problem even worse, or is it independent of hardware? also, if several AD/DA X series converters are used are delay values different on each unit?

if i understand correctly, even when using only Digi 192 interfaces, there's a need to manually compensate if more than one unit is used.

this is from Apogee, but i'm even more confused now. someone please explain!:

Quote:
The only time when ADC is crucial (with regard to hardware) is when creating
hardware inserts on individual tracks of a multi-tracked source, such as
drums. Since PT does not know the latency values of the Apogee hardware,
they need to be entered in manually. We recommend using the TimeAdjuster
plug-in. To determine the amount to enter in TimeAdjuster, do the following.

1) Find a sound with an easily identifiable transient spike and rout and
record it to a second audio track. Zoom in to the waveform, and determine
the delay in samples between the playback spike and the recorded spike.
2) Now create the hardware insert and record the spike again, determining
once again the delay between the playback and record.
3) Subtract the second delay from the first, thus giving the amount of delay
introduced by the hardware insert. Enter this value into the TimeAdjuster
plug-in.

someone said:

"You need to Run your Apogee's through a Digital 192 to Get hardware ADC The
X card does not support this feature."

Kevin Harp's answer:

This is incorrect. ADC accounts for the delay that happens with the 192
converter and its conversion process. If you add an Apogee, this will only
add to the delay.

The Apogee converters are different than the 192's because Apogee converters
have different amounts of delay when converting analog to digital and
digital to analog. They are actually faster that the 192's. You have to
manually compensate for this with ADC. If I am using a hardware insert with
my AD-16X and DA-16X then I add 25 samples when it is on the first 8 at
44.1kHz & 48kHz.

According to ADC, the 192 takes 93 samples for a hardware insert but the
Apogee AD & DA-16X's do it in 68 samples at 44.1k & 48k. I haven't had time
to figure out what it is on the second 8 or at higher sample rates.

Since the Apogee DA-16X's give you 16 Outputs and the 192's only give you 8,
Digi adds more delay to the second 8 because it would have been the next 192
in the chain. The Apogee's with the HD card look like a 192 with only 8
outputs to Pro Tools.
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