Thanks - detailed info on Jaell seems quite hard to find.
Hi Ronde,
yes. So, let's make a journey back into the past, please fasten your seat belt... . Everything comfortable? OK! ...whoooosh! - And there we are!

In the Archives of the New York Times we find the following (parts of) reviews:
I quote from the NYT archives:
1. ) from
November 25th., 1851:
Musical Matters. The second concert of the new pianist, Alfred Jaell, took place at Tripler Hall on Saturday evening. We were glad to see a fuller house than on the first night. The entertainment was choice and very satisfactory, the new artist being handsomely supported by the stars of the Opera Company.
The programme included a fantasia from Inicia[?], and a portion of the Carnival of Venice, with two or three other pieces by Mr. Jaell, which were rendered with marvellous taste and delicacy. The piano-forte is a new instrument under his finished touch. Nor should the other musical wonder, the child Adelina Patti, be forgotten. A very successful imitation of the Echo Song of Jenny Lind was vehemently encored. Signor Marini was indisposed, and did not appear, as announced; the other artists did, and were very cordially received. The primadonna Steffanone was in excellent voice, and sang effectively; and the performances of Miska Hauser called forth unbounded plaudits. Altogether, this concert was a decided hit, and Mr. Jaell may safely count upon a favorable and lasting impression in New-York.
The performance of Ernani at the Opera House last evening was a [...]
2.) from
November 17th., 1852:
[...] Boston, Monday, Nov. 14th., 1852
Sontag has given three concerts with great ap[p-]lause, and her attendant artists, Pozzolin(i), Rocco, Jaell and Paul Julien, the little crowd[?] have pursued the triumph and partaken the ga[?]. [...]
3.) from
November 17th, 1851:
Musical Matters.
The opening concert of Mr. Alfred Jaell, at Tripler Hall, was only moderately attended on Saturday evening, in consequence of the severe storm during the day. The audience was of the very best description, however ; precisely of that order the musician cares to appear before: appreciative, discriminating and sympathetic ; and Mr. Jaell has no ground of dissatisfaction with his reception. It was cordial in the extreme, and deservedly so.
The debutant is certainly a pianist of the highest rank. We have never heard Thalberg or Listz [sic] ; but in rating Mr. Jaell in a much more elevated category than De Meyer or Herz, we have no hesitation whatever. His command of the instrument is complete. His execution is brilliant and forcible, without being violent. The labored effects and startling descents upon the keys, which grated the sensitive ear of the listener to De Meyer , are much avoided as the tameness and torpidity of Henri Herz. The fingering was elegant, and easy as it was eloquent. The purest of taste seems to rule in everything; and no conception of the composer's spirit could be more thorough than the artist's in giving the fantasia upon "Sonnambula" of Thalberg. We predict that the second evening of Mr. Jaell will crowd Tripler to the root. By all admission the operatic corps of Mr. Maretzek, who assisted at the concert, exceeded themselves. [...]
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Whooosh - and back in the present time we are!

I mentioned the "Bananier", which Jaell would have played on his debut concert: It was announced as "A Negro Song". My book, Bamboula!, by Starr, from which I took the info, specifically refers in this point, as footnote, to Schonberg, "The Great Pianists", pp. 187-188, and also Vera Brodsky Lawrence, "Reverberations: 1850-1856" (Ms), vol 2 of "Strong on Music", p. 353 (which must have to do imho with George Templeton Strong).
For a short review, Starr additionally quotes a New York Times-article from
"Nov 16th, 1851", but maybe it's a typo-error and should be the
17th , which means the article I found - (it's classified by the NYT as being from the 17th) - , since Starr doesn't quote it in full, but exactly the quoted comparison of Jaell's playing to De Meyer's.
But however: Jaell seems to be an interesting area for further research!
Thank you, again, Ronde!
And greetings from 8_octaves!