Show Date: 04/29/72 
Venue: Musikhalle
City: Hamburg
State: Germany 

AUD/SBD Matrix of the Set 2 Jam

SBD Source: SBD>MR>??>DAT>CDR
Aud Patch Source: MR*>cass>SB Live!>.wav>.shn>CD-R. (* believed to be Uher Reel Machine at 4.75 cm/sec).
Aud seed disks provided by eurodead.net mastered by Bernd Weiskircher
SBD Seed disks from Raoul Duke

Pitch correction, aud patches, "matrixing" and SHN Conversion by mvernon54@home.com

Part of The Music Never Stopped Project 2003.

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Disk 1 [58:36]
Set 2 Jam
01. Dark Star-> 
02. Sugar Magnolia-> 
03. Caution (Do Not Stop on Tracks)-> Who Do You Love %

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Comments:

I created this "sbd/aud" matrix while matching the pitch of the circulating sbd to the audience tape.  
The results I think are very good.  The audience tape is excellent but lacking mostly in bass while 
the sbd has little above 8kHz, some distortion, generally "flat", colorless sound.  Simply put, the 
deficiences in either source individually are compensated in the other so the matrix sounds significantly 
better than the individual aud or sbd.

The main technical difficulty I experienced was matching the pitch of the sbd to the aud tape because it fluctuates 
throughout.  I eventually divided the set 3 jam into intervals of 30 to 60 seconds in length and then pitch 
adjusted each individually to match as best as possible using isolated audio events present in both sources.

After the sbd was pitched to the aud, the gaps from the reel flips or gaps were crossfaded from the aud.

Finally, the sub/aud matrix was created by lowering the volume of the aud by about 3db relative to the sbd and 
applying no time shift of the aud relative to the sbd. Clearly one can play around with the mix ratios and 
fixed time offsets. I looked for a combination that to my listening on headphones sounded like I was "on stage".

There are still some artifacts that you will notice if you are listening for them:
1. Small errors in the pitch matching will produce different amounts of echo.
2. The main artifact is the slight pitch difference in the audience cross-fades in the sbd in Sugar Magnolia.
This creates a "Moire effect" when matrixed with the aud source whose pitch was unchanged.  Bascially, the "noise"
is coherent in both sources so as the cross fade occurs, you detect a linear frequency ramp.

Despite these errors, this is a great jam and hopefully you will be as stunned as apparently the audience was 
that night.

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shntool track length check
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    length     expanded size   cdr  WAVE  probs   filename
    30:01.13     317727020     ---   --    ---    gd72-04-29d3matrixt01.wav
     6:28.64      68593772     ---   --    ---    gd72-04-29d3matrixt02.wav
    22:06.57     234040508     ---   --    ---    gd72-04-29d3matrixt03.wav
    58:36.59     620361300 B                      (totals for 3 files)

b77d6e67ec674b5e21f96b383a2044b7 *gd72-04-29d3matrixt01.shn
c13a6ed259ca5850a56cd85065a6f66f *gd72-04-29d3matrixt02.shn
0f1f9f2a3b7115bd860294a6643d496e *gd72-04-29d3matrixt03.shn

252c04cd11981790a68c2a52eb36285b  [shntool]  gd72-04-29d3matrixt01.shn
415de38afa158e3f1c58f4c4314fb145  [shntool]  gd72-04-29d3matrixt02.shn
eb6d8e397f796ba179b82a7ebb107fdf  [shntool]  gd72-04-29d3matrixt03.shn