There are lots of 6/8 and 12/8 styles in Band-in-a-Box, both using MIDI and RealTracks. The important point is that they are all in 4/4.

Think of a song like 'Color My World' or 'Moonlight Sonata'- some people would consider that 12/8. Others would consider it 4/4. We consider it to be 4/4 (each beat has a triplet feel). And let's say you play Color My World real fast (for fun) -would anyone consider it still to be 12/8, or is just another 4/4 swing tune?

Same with 6/8. A bar of 4/4 is the same as 2 bars of 6/8.

So things should sound fine once you use the 4/4 idea. The notation will be strictly 4/4, and there is no way for BB to show the notation in 12/8 or 6/8. If notation is the issue under discussion here - then I agree - BB has no support for 6/8 or 12/8 notation, and it will show up in 4/4.

Importing the melody from a MIDI file - it might be better to first convert the melody to 4/4 in a sequencer like RealBand. BB is supposed to convert 12/8 melodies to 4/4 automatically when you import from a MIDI file, but if that isn't working, the sequencer coversion might be the best suggestion.

Have Fun!
Peter Gannon
PG Music Inc.