I am a real newbie.  I have a 4-axis kit from CNC router parts.  I am really only using two axis' right now.  X and A (for my application).  I have these running great.  My problem, is that I need a 4 volt analog output.  I thought I would be able to do this with the VFD output, but I have had zero luck so far.  I need to trigger the 4 volts on and off just like motor switching on and off in the g code.  Any suggestions on what to try?

TIA.
J.