Then maybe you could try to use this Scriptlet:
BX3-Vibrato-Fix.gpfav (1.7 KB)
Download it to your Favorites folder (User\Documents\Gig Performer\Favorites)
then in the wiring view of Gig Performer, insert it from the (right mouse button) User–>Favorites menu and place it into the MIDI signal chain before the BX3 plugin.
There is a parameter to adjust the affected CC# (if needed).
This Scriptlet will just change an incoming ‘0’ to an outgoing ‘127’ and vice versa, so that the expected order of settings will be restored again.
…hope this helps. 