I am using Cal Edit.
I read the tune into the laptop, changed the setting then loaded them to the TwEECer. Then changed them higher (1200 RPM) and loaded those into a different tune on the TwEECer. When I ran the car on either of these it still idled at 750.
I then hooked the laptop back up and sure enough both tunes are as I changed them. Am I at the limit of the idle speed control on the TB???