@JamO, is it possible to reliably separate played flageolet tones from the input (bass) guitar tones?
On the one hand, that would be a good thing, especially with the bass guitar, to switch off the flageolet tones by autotune / elastic audio for relaxed playing in the output audio stream, which often produce disturbing high tones unintentionally in audio original/midi tones.
On the other hand, the - intentionally additionally played (with transients) - separate flageolet tones could be used as additional midi controllers for individual additional musical options, e.g. to switch articulations individually using only the fingers without additional foot pedal or breath controllers.
In addition to the bending finger controller, this is additional possibility to control additional playing options with just your fingers 