Play layered multiple voices from one midi channel

launching multiple instances of samplebox at the time ...

Hi Pete,
You can try, but I expect complexity in the area of competition for crucial hardware (both the callbacks of midi and audio won't like it).

I think of investigating note copying within samplerbox itself (third variant of techniques used for autochord and chorus).
Alas this will give a voice switching complexity within that single call back.
But it would also be a first step in development of church organ stops mentioned above, so this discussion gets the future fantasy closer to tangible things to investigate=>create.

Compared to preprocessing methods, timing will be perfect because multiple midi messages (serial by nature) are not needed. However at cost of CPU strain in the midi callback.
How many simultaneous instruments are at stake here: 2-4 or complete orchestra's ?

Hans