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#21
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Re: PT's dual low latency buffer, 110 instances of Kontakt 'n stuff.
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Dave Marsden UK |
#22
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Re: PT's dual low latency buffer, 110 instances of Kontakt 'n stuff.
We went through this with Brahath years ago in a thread. Compare the performance of PT10 at a low buffer with 11-12, its lightyears better now. This is because when recording, only the tracks in the record state have their buffer lowered. Regardless, CPU prioritization still has to happen. The CPU is sitting in a state of "ready to go" at a low buffer.
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pro-tools-pc.com TRASHER Pro Tools Utility(updated 4-11-2024) HD Native, Avid 16x16, Eleven Rack, Focusrite Clarett 8preX, UA Quad Apollo TB. Intel I7 9900k Win 10 |
#23
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Re: PT's dual low latency buffer, 110 instances of Kontakt 'n stuff.
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2022.12, OS 13, M1Max, 64gig of ram, Samsung t7 and T5 external drives, Apollo 16mkII, Apollo Twin MkII |
#24
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Re: PT's dual low latency buffer, 110 instances of Kontakt 'n stuff.
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"When a MIDI or Instrument track that is routing MIDI data to an instrument plug-in is record-enabled, Pro Tools automatically suspends Delay Compensation through the main outputs of the audio track, Auxiliary Input, or Instrument track on which the instrument plug-in is inserted. This allows for latency-free monitoring of the instrument plug-in during recording. Delay Compensation for Instrument plug-ins works only when all MIDI and audio connections take place inside Pro Tools. WhilePro Tools does not suspend Delay Compensation when you are using ReWire to connect software synthesizers and samplers in other ReWire client applications (such as Reason), Pro Tools cannot account for any latency within the ReWire client itself." My experience of using VEPro (which I still love) in PT12 is that when using large track counts, trying to record a Superior Drummer track when there are loads of other tracks and plugins running is a non-starter due to latency. If the plugins are hosted in PT (rather than VEPro) then it's perfectly possible to record with Superior (with next to zero latency) late on in a session when many other plugins are instantiated and VI's are running, so long as the output of the Superior Instrument track is routed to the main monitor outputs, not a bus. It's kind of changed my workflow since PT12...
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Mac Pro 2019 3.5GHz 8 Core 48GB RAM OS 13.6.3 Protools Studio 2023.12 Antelope Orion 32, Vienna Ensemble Pro 5, UAD Quad PCIe |
#25
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Re: PT's dual low latency buffer, 110 instances of Kontakt 'n stuff.
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In which case, the AVID video is at best misleading, and at worst, completely wrong. |
#26
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Re: PT's dual low latency buffer, 110 instances of Kontakt 'n stuff.
I think it would be fair to say that that video is a very simplified explanation of what's going on here. Probably to get people up and running, not to be a substitute for a white paper.
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~ tom thomas Formerly hobotom Pro Tools Ultimate 2024 HDX Hybrid HD Omni and 192 I/Os Windows 10 Intel Hexcore i7 All Samsung Pro SSDs Ampex MM1200 2" 24 trk tape Outboard: UREI, Eventide, Lexicon, Yamaha, TC Electronics, Orban, ART, EchoAudio, Dolby, Hughes, API, Neve, Audio Arts, BBE, Aphex, Berringer, MOTU, dbx, Allison, etc. Plug-ins: Too many to talk about. www.metrostudios.com |
#27
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Re: PT's dual low latency buffer, 110 instances of Kontakt 'n stuff.
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#28
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Re: PT's dual low latency buffer, 110 instances of Kontakt 'n stuff.
Some information I'd forgotten about from the Pro Tools 11 What's New Guide.
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Dave Marsden UK |
#29
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Re: PT's dual low latency buffer, 110 instances of Kontakt 'n stuff.
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However, I'm doubting myself now so I've just run some tests to see what's happening here because I'm still using VE Pro all the time. I created four tracks - all playing 4th notes of an identical click sample at the same level. Track 1. An instrument track hosting Kontakt with an instrument loaded containing a click sample. 2. A committed version of track 1 i.e. an audio track. 3. An instrument track hosting VE Pro. In VE Pro I have Kontakt and the exact same click instrument as in track 1 loaded. 4. An audio track where I have imported the same click sample. Any combination of tracks one through three pretty much completely null when one of any pair is phase reversed. (I say pretty much because I could just hear the click if I turned the monitors right up and stuck my ear by them! At normal to high listening levels I just couldn't hear anything.) This was at any buffer setting from 64 to 1024. (It's VERY impressive that VI Pro can do this IMO!) Obviously at a high buffers set in Playback Engine I'm getting latency but at lower buffers down to 64 there's little or no perceivable latency. I also tested different combinations of the Kontakt and VE Pro tracks in record which according to the manual automatically suspends Delay Compensation which I had on during the tests. Whatever I did the Kontakt instrument track, the VE Pro track and the committed track all effectively nulled. (This was with VE Pro set to multiply the buffer by two.) Track 4 were I imported the click sample didn't quite null but I'm guessing this was because I couldn't quite match the level with the complex gain staging in Kontakt. 0.1dB increments weren't quite enough? I dunno. Of course with just those four tracks and virtually no load on the CPU, I got a -9171 error. Yesterday when I had only those 110 Kontakt instances going, and a FAR higher CPU load I got no -9171 or -9173 errors.
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Dave Marsden UK Last edited by Marsdy; 05-19-2017 at 10:51 AM. Reason: Clarity. |
#30
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Re: PT's dual low latency buffer, 110 instances of Kontakt 'n stuff.
But is this a "HD Software" feature, or "HDX hardware" feature? Also what part of that is tied to "HD" ? I use HD software with 3rdparty hardware. Input-enabled and record-enabled audio tracks and instruments definitely run at the user selected hardware buffer size. The only part that is questionable to me, is whether or not VIs that are not record enabled are utilizing the dual buffer. I personally don't believe they are. If they are, then Pro Tools VI situation is even worse than I think it is:) I've stated this before, but it would be nice if someone from Avid would clarify this.
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2022.12, OS 13, M1Max, 64gig of ram, Samsung t7 and T5 external drives, Apollo 16mkII, Apollo Twin MkII |
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