But not here. BUT :
While writing this, I suddenly recall that it works at the album level. So, load a Playlist with tracks from several albums and then it won't work (and never will - just saying).
So that will be it.

Peter

Can't this be the difference between WAV (not) and FLAC (does) ?

New Data Point on this 2:09 situation with AI.

I'm still not sure if the problem ties to 88 vs. 44 --OR-- 24 vs. 16, could be either. 
...
[Edit: I found one album 48/24.  It multitasked.]

One problem I must report about AI:  AI is not multitasking as I expected from reading your previous posts.  I only see one yellow CPU-core light and albums load slowly as before.  Example,  one Spiro Gyra album has 8 tracks with all tracks nearly 5 minutes long, and the longest track is 5:49.  Well AI prodded through these 8 tracks one by one and I timed it with a stop watch.  This album took 2:09  to start playing. 

You can see my PC specs below.  This is a fast xxHEPC and I'm running it at 2.5GHz; I don't use playback drive. 

One other problem with AI:  hitting alt-N during unattended playback causes "DAC can't play... check settings.." (I think it's that one).  Hitting alt-P does not resolve the problem.  I need to hit alt-X and hit play button for it to play again.

The shortest path to getting to the next track is to hit, while a track is playing in unattended mode, hit alt-X, alt-S, select next track and click Play.  Well, at least that works without ever getting error.

So hitting alt-X appears to be the key.

... So let's say a more analitic sound changed into a better coherent music sound. ...

But one super major thing : I can't recognize a flavor of the filter up till now, let alone that I get crazy of the zooming etc. like commercial filters do (e.g. iZotope) no matter the settings.

Now, what I managed so far (and again I should show a plot of it) is that thinking like this (meaning : 16Khz is way than enough for me) I managed to have zero pre-ringing and only 4 post ringing samples. This is not quite true because I look at the really impacting samples as far as my imagination goes. So, there are more samples ringing but they are so minor that I can count them out (visibly). If I balance out *those* minorly ringing samples, *then* I have zero pre and 4 post. This, while I otherwise can easily have zero pre and 20 post.

The big fun (and new to me) is that I can see that such a filter indeed still kills the transients (makes sines of dirac pulses) BUT it is a totally flat filter without ripple when music is playing (which is what my special Dirac pulse train can show). So it is very well behaving.
Now, when I compare this to a normal minimum phase filter with normal roll off, it is a total mess and I envision that I see the phase behavior just in the impulse responses.

So think I already achieved something major, but I did not listen to it yet.

Peter

Side note : If Charlie says he likes a slow roll off, he must realize that this works to the LEFT of the frequency spectrum and not to the right. So, the response should be dead at 22.05KHz anyway, and the slower roll off means that we can not start at 20KHz, but e.g. at 16KHz. Just saying ...