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Paul, can't you do this on a mixer by using the pan knob for maximum music output? On the TDL 
Restoration Preamp, this kind of adjustment can be done with the left-side controls.

http://www.tdl-tech.com/data4010.htm

-- Tom Fine

----- Original Message ----- 
From: "Paul Stamler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, October 11, 2012 4:04 PM
Subject: Re: [ARSCLIST] What's the best way to remove surface noise on Columbia Shellac (1930)?


> On 10/11/2012 10:36 AM, Doug Pomeroy wrote:
>> A carefully made mono mix (L and R exactly equal) will
>> cancel that part of the the vertical component which is the
>> same in both channels.
>
> A good way to accomplish this:
>
> 1. Highlight a representative section of audio and zoom in on it.
>
> 2. Reverse the polarity of ONE channel only.
>
> 3. Set up a mono mix and adjust (in preview mode) for MINIMUM signal. By ear is usually best; you 
> want as little of the desired audio to be audible as possible. Ideally, you just hear noise.
>
> 4. Write down your settings, then undo the polarity reversal from Step 2.
>
> 5. Using the settings you wrote down, mix the whole piece down to mono.
>
> Peace,
> Paul
>