Hi:
CV radius is in whatever units the program is setup in. It joins lines to gether with small arcs of that radisu to speed things up.
CV control shoudl be left all unchecked. There is a CV thread on the forum that explains them, 99% of people need none of them.
The max speed is important though. It shoudl be set, for each axis, to the next highest frequency used. If, for example, the X is set to run at 55Khz as a max speed, then 65Khz shodul be flashed for that axis. All axis shoudl be flashed that way.
Art