My control box was in a different orientation when I built it, now it’s very difficult to see the words on the board, but one is on constantly (assuming power) and two more come on when I enter test mode, one solid and one blinks. I’ve tried both internal reference and using aref. I’ll measure between aref and agnd tomorrow and get back to you. It enters test mode, but no voltage out of aout against agnd. I’m interfacing with the g0704 motor controller, a kbic clone I believe. Yes, I do believe the led is dimmer when I command a slower spindle speed. Thanks very much for taking the time to help out, I’ll measure aref after work tomorrow.