I don't know the answer to your actual question but the problem from your question may be solved by you installing both the 64 bit and 32 bit BIAB versions. There's a work around that may be a benefit to you.

Those realtracks with Amplitube guitar effects that don't work in a 64 bit BIAB environment should still work normally in the 32 bit version and you can construct tracks you want to apply the Amplitube guitar effects to in the 32 bit version and save those tracks with the Amplitude effect applied as Artist Performance Tracks. Close the 32 bit version of BIAB and open the SGU file in 64 bit version and those 32 bit Amplitude guitar tracks will load into the 64 bit version.

Converting a track to an Artist Performance Track is easy and to access the function:
. Rt Click on the BIAB Mixer Track with the Amplitude guitar
. -> Track Actions -> Save Track as Performance File (WAV/WMA)

An Artist Performance Track saves the track as an audio file (WAV/WMA) in the folder the SGU project is saved in. You'll be prompted to save the file is you haven't already.

That's it.

When you open the 64 bit version of BIAB, any Artist Performance Track you created with the 32 bit version will automatically be found and loaded into the 64 bit version and play over the SGU chord chart.

Artist Performance Tracks will respond to tempo and key changes but do not respond to chord changes. So it is best to finalize your chord chart before you render the Amplitude guitar parts in the 32 bit version. I would likely construct my song first and then apply the Amplitude effects last. Also be aware that if you have constructed your song and BIAB has generated the 'perfect' take for the guitar and you don't want to lose it just because you also want to apply the Amplitude effect to it. You can do that too. Simply save the version of the guitar track that's perfect but was created in the 64 bit version and you want to add the Amplitude effect that can only be done in 32 bit as an Artist Performance Track.

. Save that 'perfect' performance from the 64 bit BIAB version as an Artist Performance Track then open the 32 bit version and the Artist Performance Track will open and load into the 32 bit version as an exact, frozen copy of the 64 bit track... Apply the Amplitude effect and save that as an Artist Performance Track and BIAB will update the original Artist Performance Track with the Amplitude effect added to that 64 bit 'perfect' take.

Just a thought until the 64 bit Amplitude problem is resolved. By the way, this method should work with any similar 32 bit/64 bit issue and not only Amplitude.

BIAB 2025:RB 2025, Latest builds: Dell Optiplex 7040 Desktop; Windows-10-64 bit, Intel Core i7-6700 3.4GHz CPU and 16 GB Ram Memory.