Hi,
Here’s a technique I derived from the Classical Guitar that I think could be useful to some flat pickers. The trills happen at about about 2:18 in the video. On Classical Guitar my trills are a bit unorthodox because I use a,m,i,p whereas most players use a,i,m,p, however with the pick I’m playing a downstroke with the pick for the bass note, hybrid note on high e with my m finger, then a downstroke on the b string, upstroke (also a rest stroke) on high e, and finally an upward free stroke on the b string, I realize this ends up having an outside string change so perhaps that could be tweaked for a bit more efficiency but that’s what initially felt comfortable.
Thanks,
Chris