in my exp. w/apitech valves. the plus1, although it can get down to 30-33hz. still cannot replicate the waveform needed to properly drive the apitech valve. Guessing now, that plus1 has installed internal diacs on output pins, to protect the output channel. This effecively chokes the "flyback" that a true apitech driver card creates.
What i have been successful at, is to simply using the plus1 to enable/disable an apitech driver card. The control pot still goes into the driver card. much simpler than analog_out/pwm_out to the card's input.
