I play piano/keyboard strictly for my own enjoyment, but have always played from sheet music (both right and left hand parts). I understand how BIAB 2012 allows you to enter a chord progression from a Lead Sheet or Fake Book, and then generates a backing track based upon style and tempo. That's all pretty straightforward and works great.

My question is this: A Fake Book provides the melody (for the right hand) and a chord progression (which BIAB takes care of with the backing track). So, when you play along with the track generated by BIAB, what do you play with the left hand other than those same chords? I imagine that it takes some improv skills to add some interest to the left hand.

Assuming I have this right, exactly how do you develop that improv skill, and is it a good idea to develop that while using BIAB? Or is better to develop that skillset on its own first? (If so, how do I do that?) Or is there a specific way to use BIAB to help develop that skill? -- Or perhaps I'm off-base with this assumption altogether.

I hope that I've expressed this clearly. Any pointers to help me make better use of the left hand when playing along with BIAB from a Fake Book would be appreciated.

Thanks!

Kawai VPC1 MIDI Controller; Asus A53E Laptop running Windows 7 - 64 bit; BIAB 2017 UltraPlusPak (upgraded from 2014 EverythingPak), running from Laptop's Hard Drive.