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  4. Bug in MIR

  • Bug in MIR

    T
    T

    MIR plugin v5.4.14074

    Reproducible in both Cubase 8.5.20 and Reaper 5.22. Steps to reproduce:

    1. Create new Reaper project.
    2. Create a track with a one-sample impulse at 1 second from the beginning.
    3. Add MIR as an insert.
    4. Turn on MIRx mode.
    5. Select MIRx Grosser Saal.
    6. Turn off Secondary Mic.
    7. Bypass all Room Equalizers.
    8. Turn on Wet Solo.
    9. In Reaper, render the track to a stereo stem.

    The rendered audio includes an amplitude-attenuated, non-delayed one-sample impulse. See image: http://imgur.com/a/bc7Rw

    I hadn't expected the appearance of this non-delayed impulse, so I try again:

    • In Reaper, render the track to a stereo stem.

    The second time I render, the rendered audio includes no non-delayed one-sample impulse. Comparing the two renders by ear (subtracting one from the other), they sound identical except for the non-delayed impulse.

    I get the same results when I use Cubase instead of Reaper: The first time I render, the rendered audio includes a non-delayed impulse; but the second time I render, it includes no non-delayed impulse. For rendering in Cubase, I'm routing the MIR track to a Group Track, and then I'm routing the Group Track to an Audio Track, and recording the Group Track's output on the Audio Track. This is the only way I know of in Cubase to render MIR's output to audio.

    Please describe if there's a workaround to ensure consistent renders (without the superfluous non-delayed element in the wet signal)?
  • F
    F

    Thank you very much for your report, I just managed to reproduce this problem in Cubase, as you described it.

    Some parameters in Vienna MIR Pro are being smoothed to avoid clicks, e.g. when you switch on an EQ or switch off the direct signal. This parameter smoothing is only performed while audio is running.

    As soon as I was playing audio for a few seconds before recording the output signal, the output signal is fine. Loading a project and recording the output signal immediately works also fine, the only critical case is the one you've described: changing parameters after loading a project while audio is not running and then recording it immediately.

    I'm afraid this problem occurs 'by design' and is not a bug that can be fixed. I'll look into it to confirm this, and I'll check why the parameter smoothing is not completed after one second - normally after 100ms all parameters should be completely up to date.

    Best regards, Florian
  • F
    F

    I just did another test:

    In the menu entry  "Options -> Preferences" I disabled the option "Dynamic Processing". Now your test scenario works without any remaining direct signal. This might be a first option to make sure that you get consistent rendering results.

    Best, Florian
  • T
    T
    last edited
    last edited

    @Another User said:

    ... I'll check why the parameter smoothing is not completed after one second - normally after 100ms all parameters should be completely up to date....

    I see what you mean. That is odd. So the one second of silence I had before my impulse should have already worked around the issue, but it didn't for some reason that's still a mystery.