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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 >