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Thread: Reconstructing the multitracks

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    Reconstructing the multitracks

    Jimi Hendrix - Freedom multi.flac

    As most of you probably know, a couple of Jimi Hendrix songs made it to the Rockband console game and were subsequently shared online in various multitrack formats, such as .MOGG or .OGG, and sometimes also as individual .FLAC or .WAV files. But don't be fooled by that moniker, as these are all sourced from a lossy encoding! Worse, they were almost always mixed in a way that makes the individual tracks unlistenable, with skips, jumping between tracks, fake reverb and sometimes unneeded spectral separations. Some of you might have heard of the Beatles "Moggical Mystery Tour", an attempt to piece together the "raw" multitracks from the rockband files. That is already a few years old and just relied on oopsing (phase inversion) or center extraction.

    I took that idea a little further to see what could really be achieved with all the tools, tricks and techniques I discovered this past year. These go way beyond oopsing in the traditional sense and allow me to isolate virtually anything at great quality with very little artifacts. I cleaned up a few Beatles multitracks this way and now I wanted to try this on a Jimi track. I chose "Freedom" to begin with.

    So the main objective was to
    -get everything into continous tracks
    -get as close to the original multitrack configuration as possible
    -remove compression artifacts and noise

    After initial separations with oopsing, most of the work was done in ISSE (free and open source!), employing the power of machine learning to separate one track into two. To reduce compression artifacts, the missing frequencies were first resynthesized via harmonic excitation in Audacity, and joined into the original track via spectral molding in SpectraLayers.

    Note: All files are mono FLAC files at 48kHz, so you would have to resample them incase you want to burn a CD. All files are in sync with each other, but some are incomplete and thus clipped to reduce unneeded blank space.


    Lineage:
    Master Reel -> ... -> Rockband OGG files 48kHz -> WAV 32bit 48kHz -> Audacity, Sony SpectraLayers 3, ISSE -> WAV 32bit 48kHz -> mono FLAC 16bit 48kHz

    01 Drums L
    02 Drums R
    Sound quality: A
    Completeness: A
    Confidence: A

    The drums are recorded in stereo, and it looks like they were all recorded live. The game makers have split these 2 tracks into 8 tracks, but none of that seems to be an overdub. These 4 stereo tracks were all merged down into 1, which was then split into two mono channels.

    03 Bass
    Sound quality: A
    Completeness: A
    Confidence: A
    This was mixed in stereo with track 08; the overlapping pieces have been ISSEd to remove compression artifacts.

    04 Rhythm Guitar
    Sound quality: A
    Completeness: A
    Confidence: A
    This was all over the place, in dozens of pieces! Some of it was mixed in the "guitar" track, with a lot of reverb noise from the lead guitar, and the rest was mixed in the "song" track. Everything has been isolated, then stripped of all fake reverb, delossified and finally equalized to match the raw source.

    05 Lead Guitar
    Sound quality: A
    Completeness: A
    Confidence: A
    This was mostly intact in one channel of the "guitar" track, with just a few blank spots. These could all be isolated from the "song" track by their spectral footprint, completing the lead guitar track.

    06 Congas
    Sound quality: B
    Completeness: A
    Confidence: A-
    Juma Sultan's track. This was all in the "song" track, with only fragments actually pristine; everything else was salvaged from beneath the rest. Isolated, you can hear some remains of the other tracks at times, but it works very well in a full mix.

    07 Extra Guitar + Piano
    Sound quality: A-
    Completeness: A
    Confidence: B
    These two should most likely go on separate tracks, but that would cause too many artifacts on the very faint guitar track so I decided it is better to leave them together.

    08 Fuzz Bass
    Sound quality: A
    Completeness: C
    Confidence: A
    This track doubles the bass lick in two spots with a fuzzy bass sound. After oopsing from the "rhythm" track, the rest only held compression artifacts, which have been removed.

    09 Lead Vocal
    10 Backing Vocals
    Sound quality: B
    Completeness: C
    Confidence: A
    Both vocal tracks were mixed in the "vocals" track. Oopsing yielded the raw tracks, but at the cost of amplifying the reverb between them. These might be updated in the future with a better version.

    download here: http://www.bootlegzone.com/phpBB3/vi...hp?f=2&t=35199

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  3. #2
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    Re: Reconstructing the multitracks

    Quote Originally Posted by hendrixfan1995 View Post
    Jimi Hendrix - Freedom multi.flac
    Both vocal tracks were mixed in the "vocals" track. Oopsing yielded the raw tracks, but at the cost of amplifying the reverb between them. These might be updated in the future with a better version.
    download here: http://www.bootlegzone.com/phpBB3/vi...hp?f=2&t=35199
    Appreciate your work but ...man....
    Way too much reverb in the vocals....you can hardly make them out

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    Re: Reconstructing the multitracks

    thanks!

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    Re: Reconstructing the multitracks

    WOW - thanks man - amazing - so how do we get the other songs from Cry Of Love sessions (and other stuff)??

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    Re: Reconstructing the multitracks

    Thanks! Can you tell me more about how "machine learning" is involved? I've been fantasizing for years that someday in the future a mediocre audience tape might be re-'imagined" by a computer to match the sonic profile of BOG at the Fillmore (for instance). I still think it will happen someday.

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    Re: Reconstructing the multitracks

    This is awesome work!

    Much appreciated, thank you very much.

    paulw

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    Re: Reconstructing the multitracks

    Quote Originally Posted by Roland Stone View Post
    Thanks! Can you tell me more about how "machine learning" is involved? I've been fantasizing for years that someday in the future a mediocre audience tape might be re-'imagined" by a computer to match the sonic profile of BOG at the Fillmore (for instance). I still think it will happen someday.
    Yes it would be cool to use techniques like this to make a lot of the aud recordings more palatable but then again u are potentially crossing a line of severely altering the recordings. However, in the long run that may not be completely a bad thing.

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