Hello Musocity,

Compound time signatures in Band-in-a-Box are virtually the same as their simple meter counterpart. For instance, Band-in-a-Box creates a simulated 12/8 feel by using a triplet beat resolution for a 4/4 time signature. This does not affect the tempo or pulse of the music, so if you are creating a 12/8 song in Band-in-a-Box where the tempo marking is dotted-quarter = 65, you would set the tempo in your 4/4 Band-in-a-Box song to 65.

We would recommend rendering your tracks in Band-in-a-Box to match the tempo of your song in Reaper, regardless of the time signature. There is no need to adjust the tempo to compensate for the difference in time signature because the pulse of the music remains the same.

Hope this helps!

Best,

Jerry