This week’s Kopprasch is very similar in style and content to No. 13, and my edition recommends practicing it using the same articulation variations as No. 13 (legato, dotted-eighth sixteenth).  Suggested tempo is quarter=126-132.  Although it is marked Allegro vivace, make sure that the tempo still sounds controlled.  As with all of the “sempre staccato” etudes in the book, I think it’s very important to produce as resonant a sound as possible no matter how short the notes are played. This makes sense not only from an artistic standpoint, but it also makes accuracy more consistent. When I chip notes in this one (there are a few), it is usually accompanied by a somewhat less resonant tone than the other notes around it.  Playing the arpeggios as chords on the piano also helps get the pitches in your ear.