Rigging character from Mixamo / spine matching problem

[moiamy]

Hello

I have imported a model from Mixamo and try to rig it inside Maya Human Ik., because my blending inside Trax is not working and I guess  because this rigging phase misses.

But for the spine Maya Human Ik asks for 9 bones and I have only 3 (I don't consider the hip joint)

Is there a way to overcome that ? 

Thanks

Fransua

[moiamy · Accepted solution]

Ok it was also an easy one. Just reference the first bones of the spine sequence like explained in this video 

But stangely, after I have applied "source -> control rig" in the Human Ik, I lost all previous animations in the trax editor.