Quote:
Originally Posted by kaoss  Your comment had me intrigued so I had to test this.
I use Logic mostly under DAE but today I used it with CoreAudio/MOTU 828 MkII.
I copied an identical drumbeat on two different tracks and then I ran one of them through I/O into a bypassed Portico compressor.
Now the results: Without PDC, there was an audible delay, with PDC engaged - there was comb filtering.
Even with PDC engaged I still had to nudge the 'Portico track' by 122 samples to get acceptable result.
However, I still didn't get 100% phase cancellation when flipping phase on one of the tracks. It was pretty close but I could still hear some very high freq content. I assume it has something to do with MOTU analog circuits. |
That's because Logic doesn't compensate for convertor latency (and other soundcard latencies like DSP routing matrix etc) as those don't get reported. Only soundcard buffer gets compensated.
To solve this, simply use Expert Sleepers' free Latency Fixer plugin with a correct value (220 samples for a FF800 for example) in combination with an I/O plugin. Some sort of phasing will always be going on tho, as there is no convertor that I know of that has a latency of an exact whole number of samples. So you can be maximally off by 0,5samples. Using higher sample rates make this issue smaller.