I am thinking about a control circuit for CVs in any one of the available AOUT modules.   The concept involves a -10 to 0 V source derived from the DAC and an inverting amplifier. The second op amp stage can do one of three things:   1. Inverting buffer (voltage level = 0 to 10 V) 2. Inverting amplifier (voltage level = 0 to 5 V) 3. Inverting mixer (voltage level = -5 to 5 V)   This would be accomplished by an ON-OFF-ON DPDT toggle switch. Case 1 allows the voltage to pass without any fu