I've have a play around and this bass does not seem to have a walking bass variation. In the notes for this Realtrack (#2126), it says the following...
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Bass, Acoustic, Jazz Half,Half Sw 110
Acoutic Bass RealTrack with only half notes playing throughout.
There are some eighth notes played before the half notes on occasion.
The acoustic bass has a classic warm sound.

Tempo Range: 95 - 140 bpm

Realtrack 2125 will do the job for you so if you replace the current bass (#2126) you have with #2125 and regenerate the song, you will get what you want. RT2125 is part of the same family of sounds as RT2126.
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Bass, Acoustic, Jazz Half,Quarter Sw 110
Warm acoustic bass playing in a medium slow swing style consisting of an A and B substyles.
The A section has mainly half notes with some eighth note pickups played before beat 1 or 3.
The B section plays a walking bass part for a busier sound.

Tempo Range: 95 - 140 bpm

MY SONGS...
Audiophile BIAB 2025