It's basically a case of try and try again Ady.
For S4 they mainly use the same reels. However, of late some of them need a stepper motor of 400 value which isnt right, but manages to get them working..
If you know the ammount of stops and the stepper motor type it works in multiplications of certain numbers, the starpoints are as Guitar says, multiples of 96 and so on..
This machine is f*****g old though, and, like early S4's (money to burn and some others) uses a weird reel no doubt..
If I know the exact hardware config (reel manu and model for example) then I have tech docs here that I can figure out exactly what to use in the reel thingy. But I dont know shit about magic carpet or AN
Not to be confused with illiterate f***wipes.