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I'll post it as soon as I can. 
After posting the files I changed the .ini settings:  OUTPUT_SCALE =value to 1000 and it partially solved the issue.  My Spindle output  range is now 0-10V for forward rotation.  However, this seems not to be an absolute value.  There are various other posts that use completely different values that work for them.  I haven't been able to find the parameters than influence the required value of OUTPUT_SCALE.  It is pure coincidence that I stumbled upon this solution.  It only works for forward rotation but not for reverse rotation. I would however like to rotate the spindle both ways.

[SPINDLE_0]
P = 0.0
I = 0.0
D = 0.0
FF0 = 1.0
FF1 = 0.0
FF2 = 0.0
BIAS = 0.0
DEADBAND = 0.0
MAX_OUTPUT = 2000.0
ENCODER_SCALE = -400.0
 OUTPUT_SCALE = 1000
 OUTPUT_MIN_LIMIT = 10
 OUTPUT_MAX_LIMIT = 2000

Haha, you are in luck that someone bothered to print information on that thing.

I would 

• provided nothing damaged on the machine, not touch its electrics. 
• get it running without integrating the spindle into the control. (safe that machine configuration)
• start working on spindle integration with another machine configuration (that way you can take your time to figure it out and still use the machine to cut something)

Did you do your latency test? Keep in mind: Should you have to replace the PC, a PCI or PCIe parallelport card is a means to provide a parallelport for cheap. No need to hunt down a PC with onboard parallel port.

Chances are that you can drive the VFD via PWM directly. (maybe a digital potentiometer is an easy way to do) A 2nd parallel port can be added if there is not enough IO left for the VFD.