MusicTechHelpGuy shows why Logic Pro's Session Bass Player sounds like an aimless solo until it has a chord progression to follow.
He sets the song key, opens the Chord Track from the Global Tracks, and types in chords directly, C, G, Am, E, F, C, G, tabbing between bars to build the progression.
He adjusts timing by option-dragging to compress chords that last a half note instead of a full bar, and shows how to isolate and reposition individual chords.
Once the progression repeats with Command-R, the bass region completely rewrites itself to match, turning a random-sounding part into something that actually supports the song.