Grateful Dead
February 21, 1971
Capitol Theatre, Port Chester, NY

SBD -> Dobly A Reel -> Dolby A decode -> DAT -> Sound Forge NR -> CD-R

The Sound Forge noise reduction was used to attenuate a very narrow
frequency band (in the vicinity of 8000 Hz) which was present as
interference on the original reels.  See my notes below for details.

Disc 1

Set 1
1. Cold Rain And Snow (7:24)
2. Me And Bobby McGee (8:18)
3. Loser (7:37)
4. Easy Wind (9:21)
5. Playing In The Band (5:46)
6. Bertha (6:17)
7. Me And My Uncle (4:57)
8. Ripple (take 1) (1:31)
9. Ripple (7:53)
10. Next Time You See Me (5:41)
11. Sugar Magnolia (7:33)

Disc 2

1. Greatest Story Ever Told > (4:43)
2. Johnny B. Goode
Set 2
3. China Cat Sunflower (11:36)
4. Bird Song (6:44)
5. Cumberland Blues (5:48)
6. King Bee (9:12)
7. Beat It On Down The Line (4:53)
8. Wharf Rat (11:02)

Disc 3

1. Truckin' (8:42)
2. Casey Jones (6:33)
3. Good Lovin' (16:55)
4. Uncle John's Band (7:36)


The original reels of the Port Chester run of '71 were audibly
tainted due to a cable problem. The result is a tone which hovers
around 8000 Hz with an amplitude of about +20 dB above the noise
floor. This translate to a very annoying pitch, especially during quiet
sections, which is in the old-tv-tube or lousy-hard-disk or maybe even
the-sound-you-hear-after-you-slam-your-head-against-a-concrete-wall
class of 'whine'. Because this interference is 'monochromatic' it's
easy to get rid of if you have the processing power and a quick
FFT algorithm. I used the filter-shaping capabilities of the Sonic
Foundry Noise Reduction Plugin to tailor a very narrow notch filter
which attenuated the interference without affecting the rest of the
signal. And it's all done in the digital domain. Huzzah!

As a side note, I actually ended up crafting many filters to process
these shows. The frequency of the interference actually drifted anywhere
from 7700 to 8100 Hz during a given show. This was probalby due to a
slightly wandering reel speed. It made my work harder but when I tried
a much wider filter I started to be able to hear the attenuation in the
music. The filters generally go like this:

25 dB     /- - - - - - - -\
         /                 \
        /                   \
0  dB  |                     |
       7830      7900      7970

The end result is no more annoying whine!

I also removed some of the nasty mic feedback in the 2/18/71 Bertha
using this type of filter.

Leigh Orf <orf@mailbag.com>

Update (3/19/09): This is a re-seed. I have re-encoded the files
using FLAC, and added tags. For some more discussion about the notch
filtering, please see http://orf5.com/badnr.html

a772818072e320304b100ca01ff2addd *01 - Cold Rain & Snow.flac
ed558e63c8c668c0b2b2174129a6d442 *02 - Me & Booby McGee.flac
78039813635be3b22b889f477f0aad08 *03 - Loser.flac
31d69efc3f569c2f8bc8a2aaa3095acc *04 - Easy Wind.flac
212967514015752b36778ee33752de92 *05 - Playin' In The Band.flac
28a6642e50179e7712a9262a2fae8ce3 *06 - Bertha.flac
db88fa8760e95650c5de9c7fb6ff52f2 *07 - Me & My Uncle.flac
fe1af107e319bd37ac977a472e875cb5 *08 - tuning.flac
ddf94843640c8b7408d55dae1f0a100e *09 - Ripple.flac
021f8cad5beefdc8f187f19ce49a69a7 *10 - Next Time.flac
29a2bf0b56ffe6e2ef6b1124bbd6ffdf *11 - Sugar Magnolia.flac

db10607381d7257181d2fcd460054d72 *01 - Greatest Story Ever Told ).flac
6c422e319bc421609758e2f796a1d4e1 *02 - Johnny B. Goode.flac
7c6675e554299c5026476cf3a5bc0157 *03 - China Cat Sunflower ) I Know You Rider.flac
343f424790033e38817306a696995523 *04 - Bird Song.flac
33219ab149deb2e32663be0966be5c3d *05 - Cumberland Blues.flac
a376addb9c8551caf16d9656d84aaa64 *06 - King Bee.flac
a52fdd2dd4367cb005c4c110e5d14287 *07 - Beat It On Down The Line.flac
bde5b82d38c80258a91fadf9fc32bcf1 *08 - Wharf Rat.flac

503097dfe815043a6af9c290a268ba79 *01 - Truckin.flac
607c48f7f42d362e3a32530b39d42304 *02 - Casey Jones.flac
68f5c1753d938edd604162056bebe80f *03 - Good Lovin ).flac
91bcd52da65fb20d41778ed6afb0b01d *04 - Uncle John's Band.flac

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