At the moment where you want a hold you can can select the bar's then go into MultiRiff (F8) then choose a RealTrack for that section so it will play a RealTrack Hold.
This will work best if the UserTracks is Direct Input as well as the RealTrack Hold as you will have the same FX applied to both to blend.
But if they allow UserTracks in the Multiriff you could then just have a UserTrack that is just holds, then you just change UserTracks at that bar.


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