Josh May
June Appal Recordings
On 10/23/2013 2:02 PM, Josh May wrote:

> I'll get right to the crux: I'm working on a digital transfer from a 40
> year old 1/2" master audio tape. The recording is unaccompanied singing,
> and in the transfer I've noticed a very faint bleed-through / pre-echo that
> peaks at about -36 dB. The bleed-through is only minimally noticeable in
> the silence before or after a very loud note, but due to the dynamic nature
> of the recording, I've had trouble making a gate work and sound natural.
> So my question is, how could I correct or minimize this problem without
> affecting the original recording, if at all? I'm hoping there are some
> tricks out there I'm not familiar with.

This is a nasty problem and one for which there have been many attempts at 
answering... like Studer's "skimming" low intensity erase scheme, and the 
partial erasing device that was sold many years ago by a tape manufacturer, I 
think may have been Audio-Devices.

Keep in mind that a dub of a printed through tape will not likely be of any use 
to test the ideas... sadly I believe it has to be the original for any of these 
ideas to work because of the dependency on the fragility of the
printed-through magnetic domains.

I recall some discussions about the problem a few years ago where it was 
offered that if the tape was played around a sharp bend (approaching 90 
degrees) that a significant reduction in print through was achieved.

CEDAR's Retouch process could remove the print sound on the tail of a note 
without damaging the room tone, however it is a manual case by case process and 
very time intensive.

... Graham Newton

Audio Restoration by Graham Newton,
World class professional services applied to tape or phonograph records for
consumers and re-releases, featuring CEDAR's CAMBRIDGE processes.