Ahh yes, the Flam Accent. Is it just flams in sets of 3? or simply an accented flam? I’ll opt for #2. Anyway, this has been called a “gateway” rudiment long before I came on the scene and of course there’s a big `ol workout for it in the 12 Gateway Rudiments section. Mastery of the downstroke and some finger control are prerequisites, next comes the transition between the two and the coordination. Get on it.