Received the controller Monday! Thanks Tom.
stright away had to do some upgrade cause I'm using 1.7 amp 1.8 deg nema 17. I've cut two 10x10mm openings on the back panel to suit the heat sinks for drv8825 and increase the current to 1.7amp. Then I decided to try with 0.9 deg stepprrs. My gears are 144
Worm ratio, 4:1 gear. The setup utility came up with warning when tried to use 32microsteps. Something like iVal too small. I've ignored it. On the test, mount behaved Ok, but when i tried goto target in CdC it over shoot a lot. When slewing from eqascom its ok. So decided to go for 16microsteps : everything works fine except the point of using 0.9 deg stepprrs is defeated.