Nowhere possible to go beyond a certain point. As recently as 1985 or 1989 these questions still keep coming, because the above specialization or Division of Labor notion of the 19th century has suppressed Information that everybody should have had. Diamonds may be forever, but not pianos. The composers want new resources so music can get out of stasis and forge ahead. But 17th century technology will not and cannot do it.
Somebody is crazy.
An alert friend of ours saw the editorial in a new magazine about such imitation piano-feel keyboards and sent it here. So this is not just a private gripe. It's a symptom of general malaise. That is why new publication of Darreg's piano booklet in some form or other with new information and examples in actual sound is needed. You need the benefit of co-ordinated information that has hitherto been compartmentalized into pronouncements by specialists who may be crackerjack experts in one narrow field but have not had the same access to other parts of the total musical picture.