Hi, Lou, That is a good suggestion, but we already have an M-S thing going on as I explained in a previous email. All the noise is in the L-R channel which, unfortunately was mixed back into the quiet L+R channel when the stereo was demodulated in the tuner to make the tape recording. So, the act of summing L + R from the tape will act to cancel out the noise, but the balance between L + R will need to be tuned for minimum noise, as you know when you're trying to null things, 1-2 dB in level makes a big difference. I haven't thought what subsequent M-S processing might do, but that would put it back into L+R and L-R and might be another way of looking at the same thing...just attenuating the S channel would work the same as summing, but the match is critical in either case. Cheers, Richard On 2020-09-13 4:35 p.m., Lou Judson wrote: > I wonder if an MS treament would help with multipath - EQ the side signal to reduce noise, bost the mid to compensate, then recombine. I don;t have a sample to try this on but it has worked for me for stereo noise in the past. > > <L> > Lou Judson > Intuitive Audio > 415-883-2689 > >> On Sep 13, 2020, at 1:16 PM, Lou Judson <[log in to unmask]> wrote: >> >> FM multipath? Good question. Have you tried it in mono? Mono-ing the receiver cleans it right up, but I don’t now about after it is recorded. -- Richard L. Hess email: [log in to unmask] Aurora, Ontario, Canada 647 479 2800 http://www.richardhess.com/tape/contact.htm Track Format - Speed - Equalization - Azimuth - Noise Reduction Quality tape transfers -- even from hard-to-play tapes.