This is going to sound a little odd, but on dotted crotchets in jig time.
i use 3 different techniques or rhythyms for making 3 quaver into 2 semi quaver and a quaver, titty tum tum, tum titty tum, and tum tum titty, the titty is the sound of the semis, on the concertina i do the titty with crossed fingers, on the harmonica, i suppose with the tongue,