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Gear / Technical Help => Post-Processing, Computer / Streaming / Internet Devices & Related Activity => Topic started by: Idle Wind on October 24, 2005, 01:49:57 PM

Title: fixing a dropped channel ?
Post by: Idle Wind on October 24, 2005, 01:49:57 PM
I taped Son Volt last night at the Paradise in Boston.  Great band.

461>mp2>sbm1>jb3

time for me to buy an SVU2 or whatever those meters are -
somehow, one channel dropped at about 58 minutes into the show,
and I didn't discover it until the encore, so I have around 40
minutes with only one channel.    >:(

first time I ran a JB3 without a DAT backup, though I suspect
it would've happened on the DAT - but I prolly woulda seen the
meters and fixed it a lot sooner.

Anyway, I tried pasting the left channel over the right for the missing part
in Audacity, then exporting to .wav (audacity doesn't edit the native
wav file, I guess) but my resulting file came out around 580MB, when
I started with .98 gigs, so I don't know what gives with that.   ???

any suggestions?

Title: Re: fixing a dropped channel ?
Post by: Krispy D on October 24, 2005, 02:16:32 PM
I had the same thing happen to me just a couple of days ago when one of my mics died on me.  i did the cut and paste thing in Sound Studio not audacity and it worked fine.  I know not much help but it should work.  hopefully some one more up to speed with audacity will chime in...  I have it on my 'puter but never use it.
Title: Re: fixing a dropped channel ?
Post by: Chris K on October 24, 2005, 02:20:57 PM
why would you need an svu? mp-2 has decent metering    ???
Title: Re: fixing a dropped channel ?
Post by: Idle Wind on October 24, 2005, 02:51:34 PM
why would you need an svu? mp-2 has decent metering    ???

yeah, you could blind somebody with those lights.   :)

both channels on the mp-2 were going fine all night.
something happened between the mp-2 and the jb3
(prolly the cables/connection from the mp-2 to the sbm-1,
or the sbm-1 to the jb3). 

the svu plugs into the line out of the jb3,
and I would have seen that the jb3 was only
outputting one channel.

also, I can't figure out why, when I edited the wav
in audacity, it ended up about half the size in megabytes.
Title: Re: fixing a dropped channel ?
Post by: F.O.Bean on October 24, 2005, 07:09:19 PM
<snip>

also, I can't figure out why, when I edited the wav
in audacity, it ended up about half the size in megabytes.

great idea man!

I don't use audacity but could it be that your ending file size was coincidently the same size as the section you marked for transposition to the other channel?  Perhaps the save only worked on the selection when what you wanted to do was copy the selection into the other channel and save the resultant as one file.  I could be seeing this all wrong...
Title: Re: fixing a dropped channel ?
Post by: Idle Wind on October 25, 2005, 01:54:09 PM
hmmm.  checking file>preferences
in audacity, I see the default wav format is 8 bit pcm.

changing that to 16 bit pcm will prolly result in a file
twice the size (?) which is about what I expected -
something around a gig.  I can also use a "32 bit float"
sample format which maybe is better.

I used audacity to open the native wav file which I had
x-ferred from my jb3, but audacity creates an "*.au"  file
that you edit, but you can't "save as" it as a *.wav file,
you've got to "export it" as a wav file.....

not sure what other "reprocessing" it does going from wav
to au back to wav - somehow seems less than ideal,
I'd think it at least resamples -