Sony MKS-2010 - Manual (Page 87)

Cha
p
te
r 5
Ba
si
c Op
er
a
tio
ns
87
Composing Video With Keys
To insert or delete M/E keys instantly
If you are using the 1.5M/E panel, press the [KEY1 ON] button or the [KEY2
ON] button in the M/E key transition control block.
If you are using the 1 M/E panel, press the [KEY1 ON] button or the [KEY2
ON] button in the M/E transition control block.