Byte2Bot Daughter Board/ Raspberry Pi5 issue: creating a 0-10v Spindle Voltage

I wanted to create a control voltage for my spindle using a Raspberry Pi 5 connected to a Byte2Bot parallel daughter board (Misnomer Alert – it is actually a DB25 daughterboard and has little to do with a parallel port) connected to a parallel port breakout board provided by Byte2Bot.  The parallel port breakout board has a terminal for PWM that will produce a voltage. The question is how to do it. Here is what I discovered:

This issue continues in the attachments:
LinuxCNCQuestionA
LinuxCNCQuestionB
LinuxCNCQuestionC  

And here is the Snippet:
# --- SPINDLE PWM CONFIGURATION ---

# Load and Add Functions
# (Ensure loadrt pwmgen and loadrt scale are at the top of your file)
addf pwmgen.make-pulses base-thread
addf pwmgen.update servo-thread

# 3. Connect Spindle Enable
# This turns the PWM generator on only when the spindle is active and needs to be eliminated.
# (removed) net spindle-on spindle.0.on => pwmgen.0.enable

#Inverted Voltage Corrections
# First you need to add the next two lines above
# loadrt not count=1
# addf not.0 servo-thread

# set the Frequency
# first we need to set a frequency for the PWM in order for it to smooth the output
setp pwmgen.0.pwm-freq 100.0

# Calibration
# When using a 0-10v output signal, you may need to invert the PWM output
# so that the 5 axis breakout board will output 0V at spindle off,and
# 10v when the spindle is full on. The Negative sign before the 60000 usually does this.
# unfortunately the resting (spindle off) voltage is 10.0V - bad -very bad!
# rather we leave everything alone and creat a not.0 variable that reverses the values
setp pwmgen.0.scale 60000
setp pwmgen.0.offset 0.0
setp pwmgen.0.enable 1

# Connect Spindle Speed Command
# This signal carries the RPM requested by G-code (S command)
net spindle-speed-cmd spindle.0.speed-out => pwmgen.0.value

# Prepare to invert it
net spindle-pwm-raw pwmgen.0.pwm => not.0.in

# Connect and invert the PWM Output to Physical GPIO
# This is the "Writer" for GPIO18
net spindle-pwm-final not.0.out => hal_gpio.GPIO18-out

#End Spindle Code

It appears to work fine. Any further suggestions would be appreciated.

Full HAL file attached.