I am using BIAB to generate quick backing tracks for guitar improv practice. For instance I might write 4 bars C, 4 bars F, 4 bars G and loop this over and over. I want the first bass note of each new chord section of bars to play the root note of that chord so I can really hear the transition from one chord to the next. I notice that when I push the re-generate button, often times one of the chords will not have such a bass note and often times the bass note will be the root of the key which makes the transition hard to hear for me. I will then push and re-push the re-generate button until it re-generates so I can hear the root of each chord change played. Sometime it happens with a few clicks and sometimes it takes many.

Is there any way to make the re-generate process behave the way I want it to as stated above or is it just random trial after trial?

Thanks for your help.