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Thread: DSP Effects Grabber and Fade interact poorly (bug?)

  1. #1
    GiacomoGo's Avatar
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    DSP Effects Grabber and Fade interact poorly (bug?)

    So here's what I did, and the unexpected results using dBpa MC & Audacity to view results of conversions.
    Result *3 seems to indicate a bug in the interaction of the Grabber and Fade DSP Effects:

    Objective: Cut some trailing noise off the end of a track ripped from CD to MP3 VBR standard (-V 2)

    1 - converted .mp3 file, with adding *only* the Grabber DSP Effect to take 2min 25sec from the start.
    Result: sounds good & looks (in Audacity) like the desired grab.

    2 - converted result of (1), with adding *only* the Fade DSP Effect to Fade Out over the final 2000 milliseconds.
    Result: sounds good & looks (in Audacity) like the desired grab and fade.

    3 - Tried to do this instead in a single step. Convert original track including trailing noise, with adding *both* the Grabber and next the Fade Out DSP Effects (both as configured in (1) and (2)).

    PROBLEM Result: track sounds horrible (amplified way too high, distorted) & looks overly amplified and distorted in Audacity.

    So my conclusion is that these 2 DSP Effects interact in some unexpected way.
    I would expect that the combined effects (3) should produce an identical .mp3 file as the two step process (1) + (2).

    Is this a bug, or do I need to understand some clear limitation in combining DSP Effects ... before inadvertently I destroy my mp3 library.

  2. #2
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    Re: DSP Effects Grabber and Fade interact poorly (bug?)

    Using R14.4 with the latest DSP effects?

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    GiacomoGo's Avatar
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    Re: DSP Effects Grabber and Fade interact poorly (bug?)

    Quote Originally Posted by Spoon View Post
    Using R14.4 with the latest DSP effects?
    Confirmed. According to dBpoweramp Configuration:
    dBpa MC Reference Release 14.4
    DSP Effects Release 9

    ---------------------------
    dBpoweramp
    ---------------------------
    All latest programs and codecs are installed.
    ---------------------------
    OK
    ---------------------------

  4. #4
    GiacomoGo's Avatar
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    Re: DSP Effects Grabber and Fade interact poorly (bug?)

    I had trouble reproducing the amplification/distortion. I finally did -- seems related to the track, rather than a general issue.

    However, the "Fade" DSP Effect does seem to *always* ignore the prior "Grabber" settings.
    Looks like "Fade" calculates when it should start/stop the fade without considering whether a prior "Grabber" reduces the track length.
    Just a guess.

    As far as the amplification/distortion when combining Grabber + Fade, it seems to depend on the "loudness" and perhaps variability of the recording:

    Here's a track that works OK (but no fade, as guessed above):
    http://rapidshare.com/share/12241ABE...1CCB9ADC3B921A
    [ nb: grabbed clip is smaller filesize than original ]

    Here's a track that causes dBpa MC to amplify/distort the grabbed track (and still no fade):
    http://rapidshare.com/share/04296FAD...99ECC907EA9FDF
    [ nb: grabbed clip is actually larger than original ]
    Last edited by GiacomoGo; 10-27-2013 at 11:32 AM.

  5. #5
    GiacomoGo's Avatar
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    Re: DSP Effects Grabber and Fade interact poorly (bug?)

    Just hoping for some feedback. Am I doing something wrong, or is MC?

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    Re: DSP Effects Grabber and Fade interact poorly (bug?)

    It looks like a bug, however if you include the DSP effect 'Non Live' it should work.

  7. #7
    GiacomoGo's Avatar
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    Re: DSP Effects Grabber and Fade interact poorly (bug?)

    Quote Originally Posted by Spoon View Post
    It looks like a bug, however if you include the DSP effect 'Non Live' it should work.
    Yep, this "Force Non-Live" effect let's MC do the individual steps in sequence, which produces the right results. Thanks.

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