And now we have the famous “dotted-eighth/sixteenth” etude, No. 28.  I highly recommend playing repeated sixteenth notes on these rhythms, beginning slowly and then working up to your target tempo.  After you’ve done this several times you should start to get a good feel for an accurate dotted-eighth/sixteenth rhythm.  Strive for clarity on the isolated sixteenths as well as accurate rhythm. Suggested tempo is quarter note=84-90, although Verne Reynolds notes in The Horn Handbook that “Etude No. 28 should be practiced slowly enough that we can feel the four sixteenth-notes contained in the dotted eighth and sixteenth figure. It should also be practiced quite rapidly.” (p. 60-61)