Parameter setup for the 4th axis - Newker CNC controller

Loads of parameters in there that seem to relate to various speeds and ratios:

• The axis speeds are in mm/min or degrees/min (not degrees/second!!), so the correct number would be of the order of 1200-1400, given that the driver and motor bomb out at about 15 seconds per turn.
• The units are important too. I have 2000 steps per turn set up on the stepper driver and the controller seems to generate 4 pulses per "step", so I need 8000 on the numerator and 1900 on the demominator (# in "axis" parameters). Not clear quite how all that works but certainly, the indicated units for the A axis correspond with degrees movement on the table.
• The A axis acceleration for the "rampit" (rapid) homing move works nicely when you ask it to home the A axis. If you set the number too low, it takes forever to get up to speed.

Must make some simple g code so I can test it out to see if it behaves sensibly.