Saxon1066
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Loopback Test for Latency
Hi, Folks.
So, I want to check the latency in my system to make a manual offset adjustment (In Preferences>Sync and Caching). Just wanted to ask if I'm going about this the right way. Does this procedure sound correct?
1. Uncheck the "Use ASIO reported latency" box and the "Manual Offset" box.
2. Output a track (I'm using a click track) through the SONAR main outs, from the DA converters through my mixer, into patchbay, then back into patchbay and mixer to AD, and record onto a new track.
3. Count the number of samples the two tracks are out of alignment.
4. Enter half that number of the samples into Manual Offset box.
(I figure #4 because an audio recording is only going half the round-trip of the loopback test.)
Any help is appreciated, since I ain't too bright.
Sax
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scook
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Re: Loopback Test for Latency
2014/06/11 21:35:28
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☄ Helpfulby Saxon1066 2014/06/11 22:51:59
Here is another way http://forum.cakewalk.com/FindPost/2745971 you will have to provide your own test tone I believe the link is stale in the post. It starts with the reported latency and uses the manual adjustment to correct it.
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The Maillard Reaction
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post edited by mister happy - 2017/08/25 18:10:56
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slartabartfast
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Re: Loopback Test for Latency
2014/06/11 21:37:52
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4. Dividing by two is certainly wrong.
The input to the second track is going to be delayed by the Sonar record buffer, which is not going to be a factor in the outgoing signal delay. In fact the analogue latency is going to be such a small fraction of the total time for that setup that it is not worth even considering. What exactly are you trying to compensate for?
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Saxon1066
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Re: Loopback Test for Latency
2014/06/11 21:41:17
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Delay in conversion? (DIdn't I say I ain't too bright?)
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Saxon1066
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Re: Loopback Test for Latency
2014/06/11 21:44:53
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scook
Here is another way http://forum.cakewalk.com/FindPost/2745971 you will have to provide your own test tone I believe the link is stale in the post. It starts with the reported latency and uses the manual adjustment to correct it.
Looks like I should just go with Sonar's ASIO reported latency and done.
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scook
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Re: Loopback Test for Latency
2014/06/11 22:08:35
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IDK, it was a worthy exercise in my case, the reported latency was off ~16%. I believe it is fairly common for the reported latency to be off.
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Saxon1066
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Re: Loopback Test for Latency
2014/06/11 22:16:04
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Well, FWIW, I checked the reported latency box (not doing my #1 above), added the samples the loopback was off (41 in my case), and the tracks now align perfectly in recording. For past versions of SONAR (I'm thinking it was 5.0), it was generally accepted by users that the reported latency was off, and they compensated the way I described (without my #4 above, which is definitely wrong). Not many of those SONAR users from 5.0 are still around this forum.
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scook
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Re: Loopback Test for Latency
2014/06/11 22:21:44
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Maybe so, I started way before 5.
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rbowser
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Re: Loopback Test for Latency
2014/06/11 22:28:47
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mike_mccue
http://centrance.com/downloads/ltu/ Thanks for the posting that utility, Mike. It confirms my round trip as 5.83, which is what my audio interface itself reports. I had a thread awhile back asking why Sonar lists a second figure of 58.3, and always has with my Alesis interface. The decimal point is moved over one for some reason. That's never made sense, and people on the thread were puzzled. Somehow, Sonar and the Alesis don't work together right on getting the figure apparently. This app from Centrance makes more sense, since I can't feel any detectable latency as I work. Randy B.
Sonar X3e Studio Roland A-800 MIDI keyboard controller Alesis i|O2 interface Gigabyte Technology-AMD Phenom II @ 3 GHz 8 Gb RAM 6 Core Windows 7 Home Premium x64 with dual monitors
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Saxon1066
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Re: Loopback Test for Latency
2014/06/11 22:56:14
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scook
Here is another way http://forum.cakewalk.com/FindPost/2745971 you will have to provide your own test tone I believe the link is stale in the post. It starts with the reported latency and uses the manual adjustment to correct it.
Yes, that's kinda where I was going. Classic post.
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