To use a different VST on a track in RB you assign it to a different Port.
Right-click and select a different softsynth Port and then assign the other VST to that Port.

It is done this way so you can have multiple tracks share a Port (and thus one instance of a softsynth or VST).

Softsynth ports are at the nottom of the list when you go to right-click - Ports option. You have 16 of them available, the bottomone being your default VSTi assignment.


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