Then my best advice for you is to be sure and include a letter with your submission that reminds everyone involved what a correspondence item is all about. On the IEEE Transactions for Audio, Speech and Language Processing website it says,
Correspondence items are short disclosures with a reduced scope or significance that typically describe a use for or magnify the meaning of a single technical point, or provide brief comments on material previously published in the TRANSACTIONS.
Be sure to include this on your letter, citing the IEEE website,
and maybe even include it in your paper itself.
Within your paper, call it a correspondence, rather than an article.
Furthermore, in your letter, explain to the reviewers and associate editor how your paper is a correspondence, and that you are submitting it as a correspondence, and how it, as a correspondence and not research article, should have a reduced scope that provides brief comments on previously published material,
and in fact, on material previously published in the transactions.
Include the references to the previously published material as well.
Stress the point that as a correspondence item it need not propose and test new algorithms, or solve new technical problems; but show how your correspondence does magnify the meaning of a single or few technical points.