Hello,
load first the style in the Composer. Then you can change every accompanying instrument.
Press the key "Composer", then "Copy" "From - To"
If you have copied the style in the Composer, then the key "Composer" then "p. E. Recording Memory A" presses "variation 1", then "bass".
Now you can change the accompanying instruments like Around, Accomp1-3, bass, Right 1.2 and Left.