I believe those speeds are in ascompad. Nina only provides those two. It is the same with Nina in a different mount so I am sure it is not the driver. In ascom one commands a slew and a rate I believe. This is why in the ascom pad you do not get the ramp up and down.
I limited my ascom pad max speed to prevent too much jerk upon startup and stop.
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired