Trip-
IsraTrance Team
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Posted : Jun 30, 2004 18:04
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As it was taken from another source:
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Emagic removed the "playback delay" paramter away in OSX at first and never included this in the PC version. For those not aware there is a small amount of converter latency not accounted for with most ASIO drivers that you can compensate for with Logic 6, Nuendo 2, and Samplitude 7. However, Logic 5.5.1 for Windows PC has no feature to set this.
To make sure your audio ends up on the arrange page where you played it you need to make sure you've compensated for input latency. Don't confuse this with your ASIO buffers, those are fine and Logic calculates those. A/D converter latency can be up to 200 samples with some MOTU gear and this is how late the new audio is being perceived by Logic on the arrange page.
You can test your latency by running a click track out your analog out 1 of your hardware device and run a cable right back into analog input 1. If you do this on an analog machine (and go to an adjacent track) the latency from track one to the next is about 2 samples @48k. On your digital system many ASIO drivers do not account for input converter latency at all and will end up 1-200 samples late. In OSX now there is a feature to fine tune this timing but on PC forever we've been hooped. Until now.
First you need to use the ASIO buffer delay as a coarse setting. This setting (as I've just discovered) is a multiple of your current ASIO buffer setting. You'll probably have your system set to 512 or 1024 so set the ASIO buffer delay to -1 (let's use 512 as an example). This will tell Logic to put the recorded audio 512 samples from where it "thinks" the audio was supposed to go. Yes, it's ahead of the beat now but don't panic, the problem in the first place is Logic is not getting all the information and this is step one of fixing that. This first step will be over-compensating for the delay. That's OK.
Next subtract the current sample delay introduced from the round-trip. If your ASIO delay was 200 samples, this will be 312. Now insert a Sample Delay plugin in the Master Output channel and input 312. Because the channel's new latency is not accounted for by Logic, it counteracts the (over) compensation from the ASIO buffer negative delay.
At this point we have fine-tuned the PC's ASIO timing! No more setting is required, only that you keep the small delay on the Master Channel whenever tracking.
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Thanx for valuable info.
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