I would try shopping ebay for the same type product, or just go vfd also potentially from ebay, and control it manually. I think its fairly easy to wire the vfd so that it E stops with the machine, even if it uses manual speed control. As for wiring it to be completely mach controlled,, theres a lot of fluff to read through and no solid diagram or step by step instruction,, so much room for error. My water cooled vfd spindle is very quiet.. The Z axis is louder, and so is a band saw. I run it as early as 6am some days,, no complaints about noise.