Sorry for not beeing precise enough in my description of the problem or about what I would like to achieve... I try it again:

1) the problem: using the 64 bit version, I had these last days the sound of BiaB (going through a Line 6 device) disapearing (no sound at all) in the middle of a song. I have the following info on display: "windows audio session error 9957, could not open stream for output only".
In the meantime, I have checked that the same problem occurs in the 32 bits version too.
I have "solved" this problem bei changing the audio settings to ASIO instead of WAS which was working all right up to now... So the problem may not come from BiaB but from my own set up. Any clue?

2) The next question was: May I use the new VST DX Synths plug-in (falsely described by me as plugin 64) within the 32bits version, since I have jbridge which should accept 64bits plugins. If the answer is yes, then how do I do this, since I do not find a special file within BiaB...
Thanks for all wise advice,
Bernard