-#define CA_ARG_SPEED_NOT_MOVING (CA_ARG_SPEED + 0)
-#define CA_ARG_SPEED_VERY_SLOW (CA_ARG_SPEED + 1)
-#define CA_ARG_SPEED_SLOW (CA_ARG_SPEED + 2)
-#define CA_ARG_SPEED_NORMAL (CA_ARG_SPEED + 4)
-#define CA_ARG_SPEED_FAST (CA_ARG_SPEED + 8)
-#define CA_ARG_SPEED_VERY_FAST (CA_ARG_SPEED + 16)
-#define CA_ARG_SPEED_EVEN_FASTER (CA_ARG_SPEED + 32)
-#define CA_ARG_SPEED_SLOWER (CA_ARG_SPEED + 50)
-#define CA_ARG_SPEED_FASTER (CA_ARG_SPEED + 200)
-#define CA_ARG_SPEED_RESET (CA_ARG_SPEED + 100)
+#define CA_ARG_SPEED_NOT_MOVING (CA_ARG_SPEED + STEPSIZE_NOT_MOVING)
+#define CA_ARG_SPEED_VERY_SLOW (CA_ARG_SPEED + STEPSIZE_VERY_SLOW)
+#define CA_ARG_SPEED_SLOW (CA_ARG_SPEED + STEPSIZE_SLOW)
+#define CA_ARG_SPEED_NORMAL (CA_ARG_SPEED + STEPSIZE_NORMAL)
+#define CA_ARG_SPEED_FAST (CA_ARG_SPEED + STEPSIZE_FAST)
+#define CA_ARG_SPEED_VERY_FAST (CA_ARG_SPEED + STEPSIZE_VERY_FAST)
+#define CA_ARG_SPEED_EVEN_FASTER (CA_ARG_SPEED + STEPSIZE_EVEN_FASTER)
+#define CA_ARG_SPEED_SLOWER (CA_ARG_SPEED + STEPSIZE_SLOWER)
+#define CA_ARG_SPEED_FASTER (CA_ARG_SPEED + STEPSIZE_FASTER)
+#define CA_ARG_SPEED_RESET (CA_ARG_SPEED + STEPSIZE_RESET)