In BBCSO there is a playback option “long flutter” available for the flutes. To make it work in an expression map, either of the “flz.” or “f.t.” must be used. Unfortunately that means that each note, which has to be played like that, needs the “flz.” text assigned, but at the same time MUST NOT have a trem. symbol – which is actually the common way to notate flutter tounge. It is also style guide of most publication houses to not always use both symbols that indicate the same thing.
Any trem. symbol actually overwrites the “flz.” and causes a “machine gun” effect. Re-assigning trem. in the expression map to the same playback technique does not work.
What would be the solution here to make “flz.” playback work as intended?