Fruity Loops is written in Delphi. There was a period in time where because of this, the company said there would never be a Mac version, but eventually one happened with the help of ObjectPascal.
The replies to the this comment [1] (from 2019) indicate that at Delphi was still used then for FL Studio. They link to a case study at [2], the date inside the pdf says 2015, and that Delphi has a Mac compiler they use too.
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[1] <a href="https://news.ycombinator.com/item?id=19652938">https://news.ycombinator.com/item?id=19652938
[2] <a href="https://www.embarcadero.com/case-study/image-line-software-case-study" rel="nofollow">https://www.embarcadero.com/case-study/image-line-software-c...