Bypass and Don't Bypass in Song Variations

Instead of bypassing instrument plug-ins, I would recommend to use multiple MIDI in blocks, form the same controller, routed to the different instruments. Then you can use widgets to block note-on (!) mesages in the different MIDI-In blocks, thus switch plyaing this sound off and on. Then you can have different variations with different widget states giving different sounds.

You might check also this similar thread:

or a deluxe version by using scriptlets:

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