UAD Plugin Question

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tonymemphis
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2010/02/04 19:22:56 (permalink)

UAD Plugin Question

Could someone please explain to me what the Microphone looking Icon at the bottom of the plugins do, The one to the right of the folder icon where you load or save presets. You can click it and it turns red but not sure what effect its having on the plug. Couldn't find anything in the manual.
#1

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    Middleman
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    Re:UAD Plugin Question 2010/02/04 20:24:06 (permalink)
    Page 79 in the manual - It's the live track switch for the UAD2 cards only. It reduces the plug in to its lowest latency while tracking.

    "
    Reduced latency in LiveTrack Mode is accomplished by circumventing the
    standard buffering processes. Normally, UAD-2 signal data is buffered at the
    audio interface I/O sample buffer size (such as 128, 512, or 1024 samples)
    which results in a processing delay.
    In LiveTrack Mode, UAD-2 signal data is transferred and processed “immediately”
    instead of being buffered, resulting in reduced latency.


    When LiveTrack is active, host CPU loading increases. The host load is directly
    proportional to the DSP load of the UAD plug-in(s) in LiveTrack mode,
    however host CPU is never used for Powered Plug-in processing.
    Extra Latency using LiveTrack
    When extra buffering is enabled (page 71) or when upsampled UAD plug-ins
    (page 100) are used with LiveTrack, latency is increased. Extra buffering
    adds 64 samples, and each upsampled plug-in using LiveTrack adds the
    value from Table 7 on page 101."

    And that is the last time I'm going to do your homework for you!

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    #2
    tonymemphis
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    Re:UAD Plugin Question 2010/02/04 20:54:18 (permalink)
    Thanks a million man. Guess I didn't look hard enough.
    #3
    Middleman
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    Re:UAD Plugin Question 2010/02/04 21:45:05 (permalink)
    Actually it was my pleasure. I had forgotten that feature and needed to review.

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    Billy Buck
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    Re:UAD Plugin Question 2010/02/05 09:22:14 (permalink)
    I've done some analytical testing of using the UAD-2 plugins @ low latencies and in LiveTrack mode. You can check out the following thread (from the UAD forum) in particular post #7 as it relates to LT mode. I typically use REAPER for plugin testing because of it's excellent realtime plugin analytics. You can easily see the CPU usage & PDC (if any, in samples) of every plugin, in realtime, as you change project latencies/sample rates, switch on/off the LT mode, etc. and immediately see what effect it has on your DAW performance.
     
     
    http://www.studionu.com/uadforums/viewtopic.php?f=2&t=13062&p=105700&hilit=livetrack#p105700

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    #5
    fitzj
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    Re:UAD Plugin Question 2010/02/05 09:56:59 (permalink)
    Billy Buck are you saying when mixing turn on that mic icon to cut cpu?
    #6
    Zo
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    Re:UAD Plugin Question 2010/02/05 10:14:16 (permalink)
    I don't think so , i think it's a pure take-recording future ....

    i will love to know if there's a difference in sound (null test will be great) beween the two modes ....i noticed one for the duende V3

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    #7
    Billy Buck
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    Re:UAD Plugin Question 2010/02/05 12:25:37 (permalink)

    Billy Buck are you saying when mixing turn on that mic icon to cut cpu?

     
     
    The LiveTrack mode will increase native CPU use as the UAD-2 plugins are essentailly running off your native CPU. Quite interesting to see how much native CPU a UAD plugin uses. One stereo instance of the upsampled FATSO (with tranny enabled) uses about 21% of my E8400 (3Ghz) Core 2 Duo when in LT mode @ 128 samples ASIO. With LT mode disabled the native CPU load drops to near zero (about 0.6%) as all the processing is done off the UAD-2 DSP at that point. It kinda  makes the WaveArts Tube Saturator look rather CPU light in comparison.
    Thank God for my UAD-2 QUAD, as I can easily run (8) upsampled FATSO's (with tranny enabled) and my total native CPU hit is about 4% @ 128 samples and still have about 20% DSP left for lot's of less DSP intensive plugins.  I can only get (2) FATSO's running in LT mode crackle free, but adding a third will give the rice crispies as my native CPU is pushing 60%-70% wilth just those three plugins.
     
    You would not use LiveTrack mode when you are in the mixing phase as it is not necessary (with DAW's that have auto PDC), and will only burden your native CPU. Where the LiveTrack mode does come in handy is when you are tracking/overdubbing or want to run a monitor mix and are using UAD-2 plugins at lower latencies. You would only enable those plugins that are affected. Say you have a 1176LN in the FX bin with your favorite amp sim and you want to record a new track or overdub using the 1176LN in "All buttons mode" to add a little more bite in combination with your amp sim. Set your project latency to say 128, enable input monitoring and simply enable the LT mode on the 1176LN and now you have zero plugin latency when tracking. When you are done tracking simply turn the LT mode off as you don't need it when playing back.
     
    What LT mode does is eliminate the inherent plugin latency that you get when using a DSP card. The time it takes to shuttle data to/from the card. For the UAD-2 this equates to 1x whatever the project latency is set at. If you are at 1024 then each UAD-2 plugin adds another 1024 samples to the total plugin latency (total 2048). If at 128, each UAD-2 plugin adds 128 samples to the plugin latency (total 256). The LT mode eliminates this extra processing overhead as it bypasses the I/O processing transfers to/from the DSP card and uses the native CPU instead. You can easily verify this in REAPER using it's plugin analytics. Using the 1176LN as an example, insert it into a project using a 128 project latency and you will see the PDC correctly state 128 (1 x the project latency = 128). Now simply enable the LT mode and watch the PDC suddenly drop to ZERO. No more plugin latency, as the DSP card's I/O is now bypassed and the native CPU takes over.
    post edited by Billy Buck - 2010/02/05 12:31:31

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    #8
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