The biggest of all mysteries:

SetMorphTargetDelta function in Posers API.

How to call it properly to have a morph target that contains absolutely nothing?

for i in range(len(actor_verts)):
    param.SetMorphTargetDelta(i, 0.0, 0.0, 0.0) 
This does not work. After it ran, the morph target contains what it was initialized with, e.g. the influence of JCMs.

for i in range(len(actor_verts)):
    param.SetMorphTargetDelta(i, 0.000001, 0.0000001, 0.0000001)    seems to overwrite the initial values

for i in range(len(actor_verts)):
    param.SetMorphTargetDelta(i, 1.0, 1.0, 1.0) 
    param.SetMorphTargetDelta(i, 0.0, 0.0, 0.0) 
for i in range(len(actor_verts)):
    param.SetMorphTargetDelta( )

seems to work

for i in range(len(actor_verts)):
    param.SetMorphTargetDelta(i, 1.0, 1.0, 1.0) 
    param.SetMorphTargetDelta(i, 0.0, 0.0, 0.0) 
    param.SetMorphTargetDelta( )

works only for 90% of the vertices

this some looks like either a parameter format error or bad access to memory...

Is there anyone who might know what this function is really doing or how to make it handle 0.0 value properly? I do not know how to debug Posers black heart ;-)

SmithMicro support didnt know either :(