Hi Bart,
in answer to point 4 - because the composer is the edit suite for the custom.

Hi Gunnar and Larry,
As far as changing the sounds of all variations in the composer - this could easily be done in the mixer, but what happens if you have programmed different sounds in acc 1 of var 1 and acc 1 of var 2? The mixer would have to overwrite all 20 individual sound allocations in each single composer, including those you may wish to keep eg I often use edited drums in the fills to punch through the texture on playback. Maybe the answer is to provide an overall override but with an option switch of how much of the composer you want affected by the change. This would satisfy style converters, who may quickly want to universally change an unsuitable voice that came out of a conversion, but also give the flexibility required by others who want maximum programming advantages.