Can someone please explain the jargon ‘duration toning’? what does it mean?
I’ve never heard the term “duration tuning”, but, within fixed income, I suspect that it means adjusting the duration of a portfolio, say, to match that of a benchmark, or tactically to deviate from that of a benchmark to take advantage of predicted yield curve changes.
Outside of fixed income, it is used in neuroscience with respect to identifying the source and meaning of sounds. Look here and here. (The second article is likely more interesting as it specifically refers to mustached bats.)
As for duration toning, I suspect that it involves Pilates.