If you have the chops to play left-hand bass, the SD series offers "Manual Mode" which will allow you to do just that. In this video, we start in "Arranger Mode," switch to "Manual Mode" to play our bass line and then go back to "Arranger Mode." For those that might say "I also want the other arranger tracks to keep playing," that will be coming up in another video using a feature called "Bassist Mode." For now: https://youtu.be/PrI9fzV6n-4