wrong thread, please head over to The intoxicated hangout
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Iāve been using Acoustica for years and itās a good audio editor. It also has some other restoration effects like de-reverb and noise reduction, which Iāve used creatively as well as for their intended purposes. I love the full suite of effects too.
The only thing that still gets me is how it handles zooming in and out of the waveform, and scrolling. Somehow I can never get used to it!
One of the reasons why I got TAL-DAC was for adding some HF grit and energy back to heavily slowed down samples, the jitter parameter used in small amounts and in combination with other settings can be really nice. But Iām using it more for processing single samples not for remastering old recordings, so itās probably not what you want at all.
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Iām curious to hear the material in question now. 
Is the missing high frequency content unique/exclusive to the missing freqs? Or are all the fundamental freqs present?
Iād guess that whatever āisā there of the missing freqs could be found and cleaned up with Izotope RX10.
Otherwise, one of these new AI stem separators plus something to apply/generate upper harmonics?
lol not sure if weird unsetlling vocalisations āextractedā from instrumental music is whatās required here, but it sure is an interesting result..
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Maybe this is the reason exactly, why such thing doesnāt exist - yet.
How should āsomethingā - even us - know, what was there and by what it was generated.
Even some AI would have to make a wild guess 
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Thanks everyone!
I tried the demo of Acoustica - Vitalize (a low-cost alternative to Izotope Advanced - Spectral Recovery and Izotope Standard - Spectral Denoise), and it does an okay job adding something, so this is a success 
btw., in all of the cases of those recordings, itās not a complete arrangement, but rather one track of multitracks.
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But PLEASE save the orig! I love the BoC tapes. The original release of Nlogax. Mastered version sounds weird.
Thereās something I like about shitty tape recordings. but Iām old
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As someone who recently investigated and wrote about reconstruction of an analog signal from samples, this was my first impression, but I thought about it a bit, and itās not quite so simple. Suppose you have a saw wave, whose harmonics drop off in amplitude proportional to the inverse of the multiple of the fundamental frequency. Shave off the top end with a digital filter. Those higher frequencies are gone. But looking at what is left, one can see a pattern (as if I were to say 1, 1/2, 1/3, 1/4, what comes next?) and itās not unreasonable to extrapolate. Now, doing this in a dynamic setting, probably with multiple voices, is likely quite a challenge, and would require some human intervention to tweak parameters to achieve an acceptable result, but itās not completely out of the question.
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I always keep originals and never delete anything
My use cases are stuff that was broken before it hit the tape, so tape itself is not really the problem. I actually mentioned cassette or tape only to convey that those recordings are very old. The other mentioned recording (not done by me) sounds way worse and was not stored on tape, but on hard disc
ā¦ I love shitty tape recordings, too
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You seem to agree here to what I said before ā¦ if we donāt know what the content was ā¦ itās lost.
I agree, if we know that a violine or a piano was the source, we could add higher frequencies indeed, which would populate the spectrum credible enough.
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āIf we donāt know, we donāt knowā is a bit circular. The high frequencies are gone. But we have information from what remains. The creator, recording engineer, or spectator would have further context. And the goal would not be exact recreation but plausible approximation.
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zynaptiqs unfilter can be used for that task
its an ai driven plugin that can reproduce missing frequencies in a recording or tame wrong eqalizations. it not only works on lost highs but on lost low frequencies as well. but use it with care and especially listen for hidden artifacts (as with all these āmagicalā repair tools).
https://www.zynaptiq.com/unfilter/
you can even use this to remaster old recordings from metallica to make them sound less bad
Absolutly agree 
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Unfilter doesnāt do that. Did you mean Unchirp?
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So many choices here. Unmangle. Unchop. Hell, Unsample!
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unchirp is for lossy codecs like mp3, with unfilter you can restore lost high and low frequencies. but its easy to overdo it. I used it a lot for a few month but than realized that less is more. I then switched from plugins to hardware and now polish dull recordings and mixes with an ssl fusion and tegeler audiomanufaktur cream. they are way more subtle and easier to find the right parameters.
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That is nice.
āMissing frequenciesā always seems a bit of a misnomer in that aspect in that youāre mostly adding harmonics for a āfullerā sound, but more like emphasizing / de-emphasizing quirks of recording technologies.
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