IT has the exactly the same problems with vibrato as Capstan. Maybe a shade smarter.

Any pitch correction based upon the musical material will diminish the musical materia - even with some AI. 

The only way to retain the actual performance as played is to rely on an a priori fixed reference. Imagine a gyroscope with a randomly speed-variant flywheel, it will deflect itself and change it's reference simultaneously whenever deflected by the change on position or direction. 

And it's too slow to do much IM reduction, which is the real point of HF flutter control - fixing wow is easy. 

Jamie




> On Sep 14, 2020, at 12:05 PM, Karl Miller <[log in to unmask]> wrote:
> 
> Related to RX 8...are there any opinions of the new feature to deal with pitch fluctuations and how it might be relative to capstan? I am concerned about music passages with vibrato.
> Karl
>    On Sunday, September 13, 2020, 08:12:13 PM CDT, Tim Gillett <[log in to unmask]> wrote:  
> 
> Hi Charles, Have you tried the suggestions around summing to mono? It
> can work quite well, with few or no artifacts.
> 
> Tim.
> 
> ----- Original Message -----
> From: "Association for Recorded Sound Discussion List"
> <[log in to unmask]>
> To:<[log in to unmask]>
> Cc:
> Sent:Sun, 13 Sep 2020 17:25:30 -0700
> Subject:Re: [ARSCLIST] Izotope RX8; recordings of FM broadcasts with
> multipath distortion
> 
> Richard and Lou,
> 
> Thank you very much for the ideas.  You've given me back some hope
> for 
> these tapes. I was using RX7 spectral de-noise, but it was leaving
> too 
> much residual noise, and I couldn't push it further without losing 
> content and creating artifacts.  It seems I need to be a bit more 
> adventuresome in my experimentation.
> 
> I have RX7 advanced, so the upgrade cost to 8 advanced is not too
> terrible
> 
> Will let you know if I am successful using what you have suggested.
> 
> chuck
> 
> find some non-destructive ways of
> 
> On 9/13/2020 1:48 PM, Richard L. Hess wrote:
>> 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.
>> 
> -- 
> Charles Reinsch
> KRAB Archive: www.krabarchive.com
> 
> -------------------------
> Email sent using Optus Webmail