The only amount of time it takes for me to create a MIDI bass track is the time it takes to set up the keyboard controller, the chosen MIDI synth, Arm a Track and play it in to the click.

THAT method works very well, even with the so-called "limits" to MIDI standard commands.

Beats the heck out of step-entry as to amount of time, but also as to many of the subtle timing and touch nuances as well, all in one or two passes. Like Recording Audio, playing your non-electrified instrument into a Mic.

And correcting the occasional mistake is a breeze in MIDI as compared to audio, as well.

You can tap in basslines with one of those tiny octave and a half MIDI keyboard controllers like the good old Oxygen and others. Controller buttons, knobs, wheels already come programmed for the GM commands on most of them, and are also user programmable for those "special" MIDI output options as well.

Another thing one can do is only use the MIDI Bass option on the parts of the song where the bassline must play a specified line, and still use the Band in a Box autoaccompanied RealTracks bass for the rest of the tune. I've learned that the MIDI acoustic basses and the RealTracks acoustic basses can match up in sound better than I thought they could in many cases. All depends on the MIDI samples you've got along those lines. Those kind of small sonic differences often go unnoticed, even among the golden eared musicians, if you don't tell them before they listen. There's a lot of presuggestion involved with Audio. Ethan Winer can teach one a lot about that kinda thing: https://www.youtube.com/watch?v=BYTlN6wjcvQ

--Mac