Understanding Mixer

How can I understand the Mixer for an Coaxial Helicopter?
For example:
Left swashplate servomotor, pitch axis

M: 1
S: 0 1 -10000 -10000 0 -10000 10000

Right swashplate servomotor, roll axis

M: 1
S: 0 0 10000 10000 0 -10000 10000

Upper rotor (CCW)
Mixing between yaw and thrust

M: 2
S: 0 2 10000 10000 0 -10000 10000
S: 0 3 0 20000 -10000 -10000 10000

Lower rotor (CW)
Mixing between yaw and thrust

M: 2
S: 0 2 -10000 -10000 0 -10000 10000
S: 0 3 0 20000 -10000 -10000 10000

What I dont understand is the following:

M:
O: <-ve scale> <+ve scale>

What does ve scale stand, offset, lower/upper limit, control count stand for? In your own words? Which effect do they have on a drone?

Sincerely

Johnny