The CC21-24 modulators were added for a user that needed realtime control over the initialFilterFc/initialAttenuation/attackVolEnv/decayVolEnv/releaseVolEnv/releaseModEnv/modEnvToFilterFc values in their app with their own soundfonts. It's not expected that they'll be useful for end-users (like yourself) but perhaps for other app developers with similar requirements.
If you check the modulator source options in Creative's Vienna Soundfont Studio software, you will actually see CC21-24 there. So they appear to be Creative's prefered controllers for custom use, which is why they were chosen for the BASSMIDI update.
Ok, can priorize more end users, i don't asking a experimental features like custom curve flags bugs etc. i'm requesting due standard is CC#7 to attenuation. This is used by DLS2 and SF2. (my soundfont is soundblaster measured) but i have problem with cc#7 to attenuation.
The Qualcomm Brew 4.4 synth uses CC#7 to initial, chippy bank, Mango Bank also.
That not uses this is Faith, Lloyd bank Mobile030|050|060|100|150|blackjack and bada, Why not end users, can be bassmidi adds niodulators progressively?
end users make banks, use modulators and experimental users can modify another flags. If soundblaster audigy that is base of bassmidi.
Vienna is one, and specification is other, if specification says that cc#7 to initial attenuation changes the knob curve why bassmidi whant assign this to custom?
BTW, CC22 seems as classic CC94 without vsti loaded