Mixing extruder (no replies)

I am starting work on a 3 to 1 extruder with Marlin 1.1.0-RC7 FW. I can get my 3 extruders to ratio with a sample G1 code as follows (x, y and z moves omitted and ratio add to 1.0):

G1 A1.0 B0.0 C0.0 E10
G1 A0.8 B0.2 C0.0 E20
G1 A0.6 B0.4 C0.0 E30
G1 A0.4 B0.6 C0.0 E40
G1 A0.2 B0.8 C0.0 E50
G1 A0.0 B1.0 C0.0 E60
G1 A0.0 B0.8 C0.2 E70
G1 A0.0 B0.6 C0.4 E80
G1 A0.0 B0.4 C0.6 E90
G1 A0.0 B0.2 C0.8 E100
G1 A0.0 B0.0 C1.0 E110
G1 A0.2 B0.0 C0.8 E120
G1 A0.4 B0.0 C0.6 E130
G1 A0.6 B0.0 C0.4 E140
G1 A0.8 B0.0 C0.2 E150
G1 A1.0 B0.0 C0.0 E150

How can I set one mix value to run multiple lines of moves? Modal?? I read that M649 will set the ratio outside a move but this is not working.
Repetier uses:

M163 S0 P0
M163 S1 P5
M163 S2 P1
M164 S5

But this is with Repetier FW...
Thanks