Board:   [DoveNet] Pro-Audio Discussion
Subject: Re: Tape deck
From:    Vk3jed
Date:    Tue Apr 28, 2020 15:47

@VIA: FREEWAY
-=> On 04-27-20 14:24, calcmandan wrote to Vk3jed <=-

 Vk> My interest was just mixing related songs or creatingdance tapes,
 Vk> where you want songs to crossfade in sync. :)

 ca> That sounds hella sweet. I never got that deep into it. But my bro
 ca> loved reel to reel for tha tpurpose. He really got into milisecond
 ca> editing due to radio timing requirments. Now, they just use automation

Yeah, can't do that with casettes. :D  But I have done edits as precise as a
single sample (1/44100 th of a second).  In one case, I had 2 copies of an old
song off YouTube.  One was recorded on an old mono VCR linear track (think crap
sound, high noise and inaccurate speed), and the other was recorded using a
hifi VCR, which meant the audio quality was excellent.  However, an announcer
talked over part of this recording.

Enter Audacity.  First, it was noticed that the two recordings were of
significantly different lengths.  So I trimmed them to the same start and
finish points, worked out the difference and assumed that was due to speed
errors on the track recorded on the mono VCR.  A couple of iterations and I had
the secionI wanted accurate to sub mS precision

Next was to identify the edit points where the lower quality mono copy woyld
replace thehigher quality one.  Muting was the best way to handle this,
because that preserved the timing.  The lower quality file was trimmed after
the last edit point and muted before the first edit point.  Minor adjustments
to timing were made, so the desited section of audio fitted the timing
precisely.  Test plays confirmed that there were no audible artifacts.  Doing
the edits at zero crossings helps too.

Third stage was to set the relative levels of the two files.  This had to be
done by ear, because the recordings probably had different audio processing,
especially AGC.  I also may have done some light noise reduction.  Not 100%
sureon that.

When I was happy, I merged the two tracks and the finished result sounded
great.  You can pick the edited part, if you listen carefully, because of the
different audio quality and higher noise floor, but timing and levels are
seamless to the ear. :)

 ca> tools and digital media to cut the required production hours. His
 ca> editing is usually cut down to final edits andproof listening before
 ca> the work goes on the air.

Modern tools certainly help. :)


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