Hi, Henry, If you wish to save the preservation master precisely as found, that would be acceptable and probably the correct thing to do, but include a note in the metadata about what you found. I would STRONGLY urge you not to release to the public anything dual mono. It just wastes bandwidth. If you feel that you must release dual mono to the public I would EVEN MORE STRONGLY urge you to NOT release the out-of-polarity files as is, but rather flip one channel. Attempt to learn the Wood Effect and see if you can determine which channel is correct. If this is mostly speech, you should notice that the positive peaks are, well, peakier than the negative peaks. Same area under the curve, but a different shape--slightly. Cheers, Richard On 2013-02-07 9:16 AM, Henry Borchers wrote: > "NEVER SUM TWO MONO TRACKS TOGETHER EVEN IF IN PHASE AND IN > ALIGNMENT. NEVER. ALWAYS KEEP THEM SEPARATE -- AND IT IS BETTER TO > ONLY COPY ONE OF THEM IN THE FIRST PLACE." > > I should clarify, I don't plan on summing them into a file. However, I'm > am a little worried about users having phase cancelation issues if someone > were to play the file on a mono speaker (like on a phone or a tablet. Does > anybody know if the speaker on the iPad is mono or not?) where they manage > to sum left and right. > > > -- Richard L. Hess email: [log in to unmask] Aurora, Ontario, Canada 647 479 2800 http://www.richardhess.com/tape/contact.htm Quality tape transfers -- even from hard-to-play tapes.