Four Jazz styles play two feels and switch by themselves. Latin/Swing, Bossa/Swing and Swing Two/Four switch between sections, as do the Blues styles. Ballad Double Time Feel plays a ballad on the first and last choruses and doubles up in between.

 

The switch follows the rehearsal letters, not the barlines, so a song without them cannot switch. Section A takes the first feel, sections B, C and D the second. Use a double barline at each change too: the drums fill into every double, repeat and final barline, and into no single one.

 

The sections only alternate on the first and last chorus, staying in the second feel in between, as a rhythm section does behind a soloist. To alternate on every chorus, make the player read the chart as one long chorus: remove the repeated sections, letter each section, add an opening repeat after the intro and a closing repeat at the end, write the passes as a text marking (say 7x), and set Repeats to 1.

 

One style cannot be swapped for another partway through a song.

 

For the full guide, see Accompaniment styles on the iReal Pro website.