If anyone is willing to try this, here's a simple experiment. Use _BG_BAND.STY as the style. Key = G; Tempo = 130; # bars = 9.

1) G
2) C
3) G
4) D
5) G
6) C
7) G D
8) G
9) G

Bar 9 is set to 2 beats using the Bar Settings feature. Everything else is standard 4 beats/bar.

When I do this, I get a pause during playback at the end of the chorus, and the instruments are out of alignment with the chords after that.