Basslines are one of the weak areas of arranger play. Played basslines move towards the next chord in a myriad of musical ways. The arranger bass part never knows the next chord until you play it!

Unless you’re doing a rote set of changes (12 bar blues, for instance) the style’s bassline has to remain generic and capable of going anywhere. You can help it out to a certain degree by moving to the first inversion, which will tend to suggest the 4 chord’s coming next, but it’s a pale shadow of a proper bassline.

Played basslines are generally better, but now you’re back to only having one right hand! Damned if you do, damned if you don’t! This is why I tend to favor tracks. Proper voice leading…