So there are two aspects to what Hollywood Orchestrator/Sonuscore engine does.
The first is auto mapping of the individual notes in a chord to various instruments in an intelligent way, so you can play a chord and have it voiced among the string section, brass or whatever. I have already put in a request for this here:
The second thing Hollywood/Sonuscore does is act like a multichannel phrase arpeggiator: rather than playing block chords it can play rhythms a melodies using the notes of the chord. And the phrase being played on each of the 15 midi channels it uses can be different. It also allows for drum rhythms to be programmed operating in sync with the melodic parts.
As it stands Scaler 2.4 isn’t really set up to control more than one instrument at a time. Although multiple instances can be used it is not really designed with multiple voices in mind.
I agree this functionality would be great to have. If you want instant gratification as it stands, you can point scaler’s midi output to Hollywood Orchestrator. And Hollywood orchestrator does output the midi it sends to each of the 15 instruments on individual channels. So you could mute the East-West sounds and use other sample libraries with a bit of effort.
I’m have had some email interaction with the developer of Phrasebox, which has quite a lot in common with how Hollywood Orchestrator works, and a multichannel version of that product is definitely on his horizon.
Malcolm