custom bass line

[CyrilleB]

(posted in 2013)
Yes, in a limited way, using "slash" chords ie. Cmaj7/B C9/Bb etc.
There is also a "blank" chord choice (W) allowing the bass note ie. W/B W/Bb to sound alone.
)BOB

This is not exactly true. W/B doesn't allow the bass note to sound alone. It will add the chord from the previous cell or bar on top of it (keyboard and/or guitar).
The only situation where the bass can sound alone is when there's a N.C. in the cell or bar that precedes the W/B. But this is not very useful because most of the time we use chords, not N.C. before the slash bass note