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Post by ragan on Apr 14, 2019 16:13:00 GMT -6
Buffer size does affect the HW insert delay over here. When I run a loopback test and calculate a figure, if I have to toggle the buffer (which happens often for me with PT) the delay compensation is no longer phase coherent (I run parallel HW drum bus). If I switch it back to the buffer at which I calculated the delay, it's back to coherent. Something sounds off about that... 64 - 1024 buffer mine stays at .44 msec. Interesting. How would it avoid the buffer? If you're doing a loop test with a transient source then you're looking at the full latency picture, from PT out and back to PT. I don't see how it would avoid the effect of the buffer.
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Post by mulmany on Apr 14, 2019 16:28:06 GMT -6
It doesn't, but it can calculate the RTL using the HW Delay figure. It then delays your entire project by an additional amount once a HW insert is used, just like a plug-in.
Are you sure you have your RTL figure calculated correctly.
1k square wave on an channel with a HW insert. Output of that channel to an internal buss. Input of a second channel set to the internal buss and record it and measure.
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Post by ragan on Apr 14, 2019 16:31:22 GMT -6
It doesn't, but it can calculate the RTL using the HW Delay figure. It then delays your entire project by an additional amount once a HW insert is used, just like a plug-in. Are you sure you have your RTL figure calculated correctly. 1k square wave on an channel with a HW insert. Output of that channel to an internal buss. Input of a second channel set to the internal buss and record it and measure. I was just using the initial transient of a click track but yeah, same technique. Figure out how many samples the delay is and calculate based on the sample rate. It works. When the figure is right I can actually run hardware parallel compression. Easy to hear when it gets askew.
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Post by mulmany on Apr 14, 2019 16:55:23 GMT -6
Interesting... All I can say is that I just tested 64 and 1024 buffer and it was the same figure.
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Post by ragan on Apr 14, 2019 16:57:25 GMT -6
Interesting... All I can say is that I just tested 64 and 1024 buffer and it was the same figure. I'll test again when I get a chance. I'd love for it to be buffer-independent. What version of PT are you on?
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Post by mulmany on Apr 14, 2019 17:11:05 GMT -6
Interesting... All I can say is that I just tested 64 and 1024 buffer and it was the same figure. I'll test again when I get a chance. I'd love for it to be buffer-independent. What version of PT are you on? 18.10
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Post by rrsouz on May 8, 2019 19:35:27 GMT -6
Hi!
I was having this problem and I was going crazy because the audio in pro tools was already way behind, so on a regular basis. I ran several tests with all idc settings, reinstalled apollo drivers, reinstalled pro tools, and nothing. so I had the idea of upgrading the OS to the mojave, because I was already hopeless. I reinstalled the apollo driver and left the default IDC and pro tools recorded very well, perfect sync. Then I remembered that in the past I had similar problems and had to fix the permissions of the system, so I think installing the mojave must have had the same effect. Ah, I forgot to mention that before installing the new OS I also uninstalled the UAD preferences in the folder aplication suport, maybe it had something corrupted.
It seems that this week will be released pro tools 2019, so it is possible that it has some improvement as well.
I disabled the shutdown of the HD to avoid damaging some configuration.
Just joy now.
Good luck to you guys.
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Post by jdc on May 29, 2019 12:18:04 GMT -6
has anyone checked this with pro tools 2019 to see if it's any better?
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Post by Drew @ UA on Jun 5, 2019 17:16:30 GMT -6
FYI, Avid has replicated this and it's in line for a fix. No timetable given.
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Post by Johnkenn on Jun 5, 2019 17:17:59 GMT -6
Shouldn’t I get a free Apollo 16x for this?
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Post by Drew @ UA on Jun 5, 2019 17:34:28 GMT -6
Shouldn’t I get a free Apollo 16x for this? For finding an Avid bug? Riiiiiiiight.
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Post by Johnkenn on Jun 5, 2019 17:43:31 GMT -6
Shouldn’t I get a free Apollo 16x for this? For finding an Avid bug? Riiiiiiiight. Ok...an 8x
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Post by Drew @ UA on Jun 6, 2019 4:42:51 GMT -6
On FedEx vehicle for delivery.
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