I want to create a backing track in GB '09--how to change chords?

Question

I want to create a backing track for a song I've written.   I want to use all software instruments--drums, bass, strings, guitar. (It's akin to a disco/Philadelphia sound fmor the early/mid-70s.)  The idea is that this will be playing over a sound system while I sing the song live in a performance.
I have figured out how to use the instrument loops as well as establish the key and the tempo.   At this point, though, I don't know how to get the guitar/bass/strings to change the chords.   For example, I start in Bb minor for two measures, then got to F7 for two measures, back to Bb minor for two measures, and then A diminished for two measures.  Can anyone give me guidance as to how to plunk in these chords?   Thanks.

Answer 1

At this point, though, I don't know how to get the guitar/bass/strings to change the chords.
A basic chord progression can be done by transposing a copy of the loop using "pitch" slider in the Track Editor. For example, setting the Pitch slider to "-3" will transpose the selected loop down three half note steps. To go from Bb to F set the slider to "-5". The loop browser can beset to show only major or minor chords in the "Scale" pop-up menu.
Only, to add a seventh or to make a chord "diminished", transposition alone will not suffice. In this case it is best to use software instrument loops, where you can shift the individual notes in the Track Editor or add a seventh note, like below, with an "A"  added to the basic Bb major. For "A diminished" lower the top note by two half steps and transpose by +2 half note steps.