To use the Feedrate override press F11 and then use the MPG to increase or decrease the Feedrate. Note you cannot exceed 100%
This works great to change speed on the fly and is something I use quite a bit. Using the MPG is far easier than the + & - keys.
The same is true of Speed override.
To use the Speed override press F12 and then use the MPG to increase or decrease the Feedrate. Note you cannot exceed 100%
Please note that when you go back to Jog mode you need to select the axis you want to override the current override mode. If you are on the X axis ans want to jog the X axis you need to change to another axis and back again.
Spindle override and Feedrate override are mentioned in the keyboard shortcuts though it does not specifically mention the use of the MPG as one way of changing the value.
I recognize that the documentation it needs more work
https://www.masso.com.au/masso-documentation/?section=keyboard-and-key-shortcuts
Cheers
Peter