I had a following problem. Do not turn off the built-in electronic keyer in Maestro. Always at the circuit connector Key passed the dot. I have included in the menu, but there is no off. Built-in electronic key is always on.
for stright key, Use a 1/8 TRS onnector then in the Maestro MENU>Phone/CW menu, set Iambic Disabled and Swap(DASH/DOT) enabled. This should allow you to use a straight key on the tip of the connector.. I think you will need to NOT use a tip and sleeve connector ( the ring needs to be open circuit).